Articles

Articles are a collaborative effort to provide a single canonical page on all topics relevant to the practice of radiology. As such, articles are written and edited by countless contributing members over a period of time. A global group of dedicated editors oversee accuracy, consulting with expert advisers, and constantly reviewing additions.

828 results found
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Snowman sign (pituitary macroadenoma)

Snowman sign in neuroimaging refers to the configuration of many pituitary macroadenomas. As they are soft tumors they are indented by the diaphragma sellae giving them a snowman configuration (or "figure 8" or "dumbbell" configuration). This feature helps in differentiating these tumors from me...
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Snowman sign (total anomalous pulmonary venous return)

Snowman sign refers to the configuration of the heart and the superior mediastinal borders resembling a snowman. This is seen in total anomalous pulmonary venous return (TAPVR) type I (supracardiac type). It is an abnormality of the fetal circulation wherein the entire pulmonary venous flow is ...
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Snowstorm sign (complete hydatiform mole)

Snowstorm sign in obstetric imaging is classically seen in complete hydatiform mole. It is characterized by the presence of many hydropic villi which gives the ultrasonographic appearance of a central heterogeneous mass having a solid, hyperechoic area and interspersed with a multitude of cystic...
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Snowstorm sign (disambiguation)

Snowstorm sign may refer to: snowstorm sign: complete hydatiform mole (ultrasound) snowstorm sign: extracapsular breast implant rupture (ultrasound) snowstorm sign: thyroid pulmonary metastases (chest radiograph)
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Snowstorm sign (extracapsular breast implant rupture)

Snowstorm sign on breast ultrasound imaging represents the presence of free silicone droplets mixed with breast tissue giving a characteristic heterogeneous echogenic appearance with the dispersion of the ultrasound beam. It is considered the most reliable sign of extracapsular breast implant ru...
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Soft tissue rim sign

The soft-tissue rim sign is used to distinguish a ureteric calculus from a phlebolith. The former appears as a calcific density with a surrounding rim of soft tissue which represents the edematous ureteric wall. Phleboliths on the other hand usually have imperceptible walls (although up to 8% ma...
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Sonographic halo sign

Sonographic halo sign is used in a number of situations. They include: hypoechoic halo sign (also known as target or bull's eye sign) in liver metastases: used in hepatobiliary imaging, is a concerning feature for malignant lesion if the lesion is a hyperechoic liver lesion 1,2 ultrasound halo...
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Sonographic Murphy sign

Sonographic Murphy sign is defined as maximal abdominal tenderness from pressure of the ultrasound probe over the visualized gallbladder 1,2. It is a sign of local inflammation around the gallbladder along with right upper quadrant pain, tenderness and/or a mass 2. It is one of the most importa...
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Spade phalanx sign

Spade phalanx sign refers to a characteristic distal phalangeal shape in acromegaly. Radiographic features Plain radiographs The terminal phalangeal tufts become hypertrophied and have a "spade appearance". Other findings on hand radiography of acromegaly include joint spaces may be minimal...
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Spaghetti sign

The spaghetti sign may be seen in upper urinary tract bleeding. It refers to the presence of a linear worm- or spaghetti-like filling defect within a contrast-opacified bladder 1,2. This linear filling defect represents blood clot extruded from the ureter and thereby moulded into a tubular shap...
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Spalding sign (fetal demise)

The Spalding sign refers to the overlapping of the fetal skull bones caused by collapse of the fetal brain. It appears usually a week or more after fetal death in utero.  This finding was originally described by Alfred Baker Spalding (1874-1942), an American obstetrician 2, on abdominal radiogr...
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Spilled teacup sign (wrist)

The spilled teacup sign describes abnormal volar displacement and tilt of a dislocated lunate on lateral radiographs of the wrist 1,2. The convexity of the lunate is no longer in articulation with the distal radius while the concavity is no longer in articulation with the capitate. It is an impo...
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Spinnaker sign (mediastinum)

The spinnaker sign (also known as the angel wing sign) is a sign of pneumomediastinum seen on neonatal chest radiographs. It refers to the thymus being outlined by air with each lobe displaced laterally and appearing like spinnaker sails. This is distinct from the sail sign appearance of the nor...
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Split hand sign

The split hand sign is a clinical sign classically seen in amyotrophic lateral sclerosis (ALS) and refers to loss of pincer grasp due to preferential wasting of the thenar eminence (abductor pollicis brevis and first dorsal interosseous muscle) with relative preservation of the the hypothenar em...
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Split pleura sign (empyema)

The split pleura sign is seen with pleural empyemas and is considered the most reliable CT sign helping to distinguish an empyema from a peripheral pulmonary abscess (see empyema vs pulmonary abscess) 1,2.  The sign results from fibrin coating both the parietal and visceral surfaces of the pleu...
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Spoke wheel sign (meningioma)

The spoke wheel sign refers to the pattern of vessels coursing through meningiomas, when seen in cross-section.  It is the result of the same phenomenon which results in the sunburst pattern (vessels seen from the side rather than in cross-section). Terminology A similar appearance also referr...
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Stack of coins sign (bowel)

Stack of coins sign refers to the appearance of small bowel folds that are smoothly and uniformly thickened 1. The margins between the folds are sharply delineated and the arrangement of clearly demarcated parallel folds is likened to a stack of coins or a picket fence. This sign is distinct fro...
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Staghorn calculus (kidney)

Staghorn calculi, also sometimes called coral calculi, are renal calculi that obtain their characteristic shape by forming a cast of the renal pelvis and calyces, thus resembling the horns of a stag. For a general discussion of renal calculi please refer to nephrolithiasis. Epidemiology Stagh...
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Stag's antler sign (lungs)

The stag's antler sign refers to upper lobe pulmonary venous diversion (cephalisation) in pulmonary venous hypertension or pulmonary edema as seen on frontal chest radiograph. The prominence of upper lobe pulmonary veins resemble a stag's antlers. It is the earliest sign of pulmonary venous hyp...
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Starfield pattern (fat embolism)

A starfield pattern has been described as being typical of DWI imaging of patients with cerebral fat embolism 1,2. Although the term is closely linked to the diagnosis of fat embolism, it should be noted that such an appearance is merely the result of very numerous microemboli. As such a similar...
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Starry sky appearance (ultrasound)

A starry sky appearance refers to a sonographic appearance of the liver parenchyma in which there are bright echogenic dots throughout a background of decreased liver parenchymal echogenicity. Although usually associated with acute hepatitis, this sign has been found to have poor sensitivity and...
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Steeple sign (trachea)

The steeple sign, also called the wine bottle sign, refers to the tapering of the upper trachea on a frontal chest radiograph reminiscent of a church steeple. The appearance is suggestive of croup, which should be obvious clinically. A corresponding lateral x-ray would show narrowing of the subg...
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Steinberg sign (Marfan disease)

The Steinberg sign, also known as the thumb sign, is one of the clinical examination tests for Marfan disease in the hands. It is a clinical test in which the tip of the thumb is visible medial to the little finger when it is clasped in the clenched hand.  See also thumb sign (disambiguation)
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Steinstrasse

Steinstrasse [stīn′shtra-se] is the German word for "stone street", describing a possible complication of extracorporeal shock wave lithotripsy (ESWL) for urinary tract calculi, wherein a column of stone fragments forms that blocks the ureter. Incidence Steinstrasse usually develops 1 day to 3...
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Stener lesion

Stener lesions are seen in the context of a torn ulnar collateral ligament of the thumb's metacarpophalangeal joint (gamekeeper's thumb).  Pathology Normally, the ulnar collateral ligament lies deep to the adductor pollicis tendon. A Stener lesion is characterized by slippage of the torn end o...
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Stepladder sign (disambiguation)

Stepladder sign may refer to: intracapsular breast implant rupture (ultrasound) gas-fluid levels in obstructed small bowel (erect abdominal radiograph)
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Stepladder sign (intracapsular breast implant rupture)

The stepladder sign is a sonographic sign indicating an intracapsular breast implant rupture. It is considered the most reliable ultrasonographic finding in silicone gel breast implant intracapsular rupture. It is identified as multiple, discontinuous, parallel, linear echoes in the lumen, and i...
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Stepladder sign (small bowel obstruction)

Stepladder sign represents the appearance of gas-fluid distended small bowel loops that appear to be stacked on top of each other, typically observed on erect abdominal radiographs in the setting of small bowel obstruction. 
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Stierlin sign (tuberculosis of ileocecal junction)

The Stierlin sign refers to repeated emptying of the cecum, seen radiographically as barium remaining in the terminal part of the ileum and in the transverse colon. This occurs due to irritation of the cecum caused by M. tuberculosis. It is not specific for tuberculosis and can also be seen in C...
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Stipple sign (transitional cell carcinoma)

The stipple sign refers to the pointillistic end-on appearance on intravenous pyelography or retrograde pyelography of contrast material tracking into the interstices of a papillary lesion. Because the majority of transitional cell carcinomas (TCC) have a papillary configuration, the presence of...
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Straight left heart border sign

Straight left heart border sign is a recently described finding on chest radiograph. It is a fairly specific (84%) sign of hemopericardium after a penetrating chest trauma, although sensitivity at 40% is relatively poor. Positive predictive value (PPV) was found to be 89% 1. It is different to ...
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Strawberry gallbladder

Strawberry gallbladder refers to the surface appearance (not shape) of the mucosa of the gallbladder due to multiple small collections of triglycerides and cholesterol esters within the lamina propria of the gallbladder wall (gallbladder wall cholesterolosis).  Strawberry gallbladder represents...
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Strawberry skull

Strawberry skull refers to the shape of the head on an antenatal ultrasound. Epidemiology Associations In general, strawberry skull is considered one of the non-specific 'soft markers' for abnormal fetal development. It is considered more closely associated with trisomy 18 (Edward syndrome). ...
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Striated nephrogram

Striated nephrogram is a descriptive term indicating an appearance of alternating linear bands of high and low attenuation in a radial pattern extending through the corticomedullary layers of the kidney on iodine-based intravenous contrast enhanced imaging. It is important to know that a simila...
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String of beads sign (renal artery)

The string of beads sign is the description typically given to the appearance of the renal artery in fibromuscular dysplasia (FMD) but may also be used to describe the appearance of splanchnic arteries in segmental arterial mediolysis (SAM). It refers to the appearance arising from the stenoses ...
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String of pearls sign (disambiguation)

String of pearls sign can refer to: string of pearls sign on an abdominal radiograph of fluid-filled dilated small bowel loops string of pearls sign on ultrasound in polycystic ovarian syndrome string of pearls sign for angiographic appearances in fibromuscular dysplasia
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String of pearls sign (gastrointestinal)

The string of pearls (or beads) sign can be seen on upright or decubitus abdominal radiographs as well as on CT in patients with small bowel obstruction, increased intraluminal fluid, and slow resorption of intraluminal gas. It consists of an obliquely or horizontally oriented row of small gas ...
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String sign (artery)

The angiographic string sign, also known as the carotid string sign, refers to the thin string of intravenous contrast material distal to a stenotic focus in the internal carotid artery (ICA).  Pathology A thin stripe of flow is caused by decreased pressure and flow distal to the stenosis, whi...
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String sign (bones)

The string sign of parosteal osteosarcoma refers to the plain radiographic/CT appearance of a radiolucent cleavage plane between portions of the tumor and cortex of the affected bone. The tumor stalk becomes more broad-based with time, obliterating the string sign in later stages. The string si...
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String sign (bowel)

The gastrointestinal string sign (also known as the string sign of Kantor) refers to the string-like appearance of a contrast-filled bowel loop caused its severe narrowing. Originally used to describe the reversible narrowing caused by spasms in Crohn disease, it is now used for any severe narr...
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String sign (disambiguation)

The string sign may refer to: angiographic string sign gastrointestinal string sign string sign of parosteal osteosarcoma
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Stuck temporomandibular joint disk

A stuck disk refers to a temporomandibular joint (TMJ) disk which does not translate anteriorly out of the mandibular fossa onto the articular eminence, but rather remains (thus "stuck") in the fossa. It is a form of TMJ dysfunction and is typically associated with restricted range of motion. T...
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Subcapsular line sign (intracapsular breast implant rupture)

The subcapsular line sign is a small localised leak from a silicone implant that leads to the formation of a thin layer of silicone between the implant shell and the fibrous capsule. It represents a minimally collapsed intracapsular breast implant rupture. It is best appreciated by MRI.
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Subcoracoid triangle sign

The subcoracoid triangle sign refers to obliteration of the fat triangle between the coracohumeral ligament (CHL) and the coracoid process. It is considered a specific but not sensitive sign for adhesive capsulitis of the shoulder 1. 
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Subpleural line

Subpleural line refers to a thin curvilinear opacity, 1-3 mm in thickness, lying less than 1 cm from and parallel to the pleural surface. Etiology dependent atelectasis of normal lung if seen in the dependent posteroinferior portion of lung of a patient in the supine position (disappears if pr...
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Sugar coating

The so-called "sugar coating" or zuckerguss (German for sugar icing) is seen in post-contrast images of the brain and spinal cord in patients with leptomeningeal drop metastases or leptomeningeal carcinomatosis. It is seen both as a result of CNS involvement from distant primaries as well as dir...
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Sulcal effacement

Sulcal effacement is a local secondary sign of mass effect in the cranium. Any lesion exerting mass effect on brain parenchyma can push adjacent gyri together, thereby displacing the CSF from the sulci. It is greatest at the site where the cause of the mass effect is located (e.g. tumor, hemorr...
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Sunburst appearance (bone)

Sunburst appearance is a type of periosteal reaction giving the appearance of a sunburst secondary to an aggressive periostitis. It should not be confused with the sunburst sign of meningioma vascularity.  The sunburst appearance occurs when the lesion grows too fast and the periosteum does not...
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Sunburst sign (meningioma)

The sunburst sign refers to the characteristic vascular supply seen in some meningiomas when seen from the side (tangential to the dural attachment). It is the result of the same phenomenon which results in the spoke wheel pattern of vessels (viewed in cross-section, parallel to dural attachment...
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Sunset eye sign

The sunset eye sign (also known as the setting sun phenomenon) is a clinical phenomenon encountered in infants and young children with raised intracranial pressure (seen in up to 40% of children with obstructive hydrocephalus and 13% of children with shunt dysfunction 1).  It consists of an up-...
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Swallow tail sign (substantia nigra)

The swallow tail sign describes the normal axial imaging appearance of nigrosome-1 within the substantia nigra on high resolution T2*/SWI weighted MRI. Absence of the sign (absent swallow tail sign) is reported to have a diagnostic accuracy of greater than 90% for Parkinson disease and dementia ...
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Swan neck deformity (fingers)

Swan neck deformity is a deformity of the digits that consists of: hyperextension of the proximal interphalangeal (PIP) joints compensatory flexion of the distal interphalangeal (DIP)  joints Pathology Swan neck deformity is seen in 3,4: rheumatoid arthritis (classical association) post-tr...
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Swirl sign (intracranial hemorrhage)

The swirl sign refers to the non-contrast CT appearance of acute extravasation of blood into a hematoma, for example an extradural hematoma or subdural hematoma. It represents unclotted fresh blood which is of lower attenuation than the clotted blood which surrounds it 1. It is the corollary of...
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Swischuk line

The Swischuk line is helpful in differentiating pathological anterior displacement of the cervical spine from physiological displacement, termed pseudosubluxation. Measurement the line is drawn from anterior aspect of posterior arch of C1 to anterior aspect of posterior arch of C3 the anterio...
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Swiss cheese sign (lungs)

The Swiss cheese sign has been used for the appearance on CT of fluid-containing pneumatocoeles, that typically occur following pulmonary lacerations 1. The pneumatocoeles appear as 'holes' in the lung parenchyma and hence the description with respect to Swiss-style cheeses (e.g. Emmental), whi...
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T1 black holes

T1 black holes are hypointense lesions commonly seen on T1WI in patients with multiple sclerosis, and indicates the chronic stage with white matter destruction, axonal loss and irreversible clinical outcome. There is a correlation between the number of black holes and patient positive outcome 3.
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T2 dark spot sign

T2 dark spot sign is an MRI appearance of endometriomas seen as a result of chronic hemorrhage. The sign is useful in differentiating a solitary endometrioma from a functional hemorrhagic ovarian cyst, as both might show high T1 signal with T2 shading.  The T2 dark spot, described in the sign, ...
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T2-FLAIR mismatch sign

The T2-FLAIR mismatch sign describes the MRI appearance considered highly specific for diffuse or anaplastic astrocytoma (IDH-mutant, 1p/19q-non-codeleted molecular status) as opposed to other lower grade gliomas. On T2WI, the tumor has homogeneously high signal intensity. On T2-FLAIR, the major...
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Talar beak sign (talus)

The talar beak sign is seen in cases of tarsal coalition, and refers to a superior projection of the distal aspect of the talus. It is most frequently encountered in talocalcaneal coalition. It is thought to result from abnormal biomechanic stresses at the talonavicular joint.  Differential dia...
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Tam o' shanter sign (skull)

The "tam o' shanter" is a Scottish hat, named after the character in Robert Burns' 1 poem of the same name. The appearances of advanced Paget disease of the skull are similar in appearance to the hat.  Paget involvement of the skull, with widening of the diploic space and an overall enlargement...
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Tangential calcium sign

A tangential calcium sign is a sign seen with an aortic aneurysm rupture. The calcified intimal rim is discontinuous and is seen to tangentially point away from the aneurysmal lumen. This sign is seen at the point of breach. There is associated retroperitoneal leakage.
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Target sign (choledocholithiasis)

The target sign of choledocholithiasis is a finding seen on contrast-enhanced CT and comprises: central density within the bile duct: stone surrounding low density: bile or mucosa
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Target sign (disambiguation)

There are many bull's eye signs, also referred to as target signs: red bone marrow located in the shaft of long bone with central yellow marrow on MRI peripheral plexiform neurofibromas on MRI intussusception: see target sign of intussusception choledocholithiasis: see target sign of choledo...
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Target sign (intussusception)

The target sign of intestinal intussusception, also known as the doughnut sign or bull's eye sign. The appearance is generated by concentric alternating echogenic and hypoechogenic bands. The echogenic bands are formed by mucosa and muscularis whereas the submucosa is responsible fo the hypoec...
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Target sign (pyloric stenosis)

The target sign of pyloric stenosis is a sign seen due to hypertrophied hypoechoic muscle surrounding echogenic mucosa, seen in pyloric stenosis. This is likened to that of a target. See also antral nipple sign cervix sign of pyloric stenosis shoulder sign of pyloric stenosis
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Target sign (tuberculosis)

The target sign of tuberculosis refers to the bull's eye appearance of some parenchymal tuberculomas involving the brain (see: CNS tuberculosis) and solid abdominal organs (see: hepatic and splenic tuberculosis) on cross-sectional imaging.  Radiographic features Ultrasound hypoechoic nodules ...
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Tattoo sign (mammogram)

The tattoo sign is a feature given to describe dermal calcifications seen on mammography 1. The basis of this sign is that dermal calcifications maintain fixed relationships to one another that are reproducible with similar projections at different times. This is in contrast to intramammary calc...
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Tau sign

The tau sign represents the appearance of a persistent trigeminal artery on the sagittal plane of an angiogram or on sagittal MRI images. It resembles the greek letter τ, pronounced 'tau'. Persistent trigeminal artery arises from the junction between the petrous and cavernous ICA and runs poster...
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Teardrop sign (ankle)

The ankle teardrop sign is one of the radiological signs of an ankle joint effusion. It represents the presence of excess fluid in the inferior part of the anterior compartment of the ankle. Pathology Etiology trauma gout rheumatoid arthritis synovitis septic arthritis Radiographic featu...
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Teardrop sign (intracapsular breast implant rupture)

The teardrop sign indicates an uncollapsed intracapsular breast implant rupture and is seen as a small focal invagination of the implant shell caused by a minimal concealed leak of droplets of silicone outside the shell where the two membranes contact each other. It is best appreciated by MRI. ...
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Teardrop sign (superior mesenteric vein)

The teardrop sign of the superior mesenteric vein is one of the important signs in the local staging of pancreatic adenocarcinoma. Its importance lies in its diagnostic, as well as prognostic, significance. This sign is used in assessing the resectability of pancreatic cancer. Radiographic feat...
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Tectal beaking (midbrain)

Tectal beaking refers to the fusion of the midbrain colliculi into a single beak pointing posteriorly and invaginating into the cerebellum. It is seen with a Chiari type II malformation. Terminology The term bird beak sign is used in a number of other contexts: see bird beak sign (disambiguati...
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Telephone receiver deformity

A telephone receiver deformity is a characteristic bowing of the shaft of the long bones, usually the humeri or femora, seen in thanatophoric dysplasia.
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Telltale triangle sign

The telltale triangle sign, also known as the triangle sign or telltale triangle, is a radiographic sign seen on plain abdominal radiograph that signifies presence of pneumoperitoneum 1. It describes the appearance of a radiolucent triangle of gas formed between three loops of bowel or between t...
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Temporal tap maneuver

Temporal tap maneuver consists in tapping over the ipsilateral superficial temporal artery while assessing the carotid bifurcation on Doppler ultrasound aiming to produce a reflected flow in the external carotid artery (ECA) and thus helping to distinguish which vessel is being assessed: externa...
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Tensile gallbladder fundus sign

The tensile gallbladder fundus sign is positive when the gallbladder fundus is seen to bulge into, and distort, the anterior abdominal wall and is a feature of acute cholecystitis. It is particularly useful as an early sign of the condition on CT as it has around a 75% sensitivity and 95% speci...
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Tent sign (breast)

The tent sign is a term referring to a characteristic appearance of the posterior edge of the breast parenchyma when a mass (usually an infiltrating lesion) causes its retraction and forms an inverted "V" that resembles the tip of a circus tent. The detection of a "tent sign" is facilitated by ...
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Terry Thomas sign

The Terry Thomas sign refers to an increase in the scapholunate space on an AP radiograph of the wrist (or coronal CT). The increased distance indicates scapholunate dissociation (often with rotary subluxation of the scaphoid) due to ligamentous injury. There is no consensus as to what measureme...
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Thimble bladder

Thimble bladder​ is a descriptive term for extreme fibrosis and contracture of the bladder walls, resulting in a tiny bladder. The term is usually used to describe changes from advanced genitourinary tuberculosis.
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Thin postcentral gyrus sign

The thin postcentral gyrus sign is an anatomic landmark useful for identifying the central sulcus on cross-sectional imaging. The anteroposterior dimension of the postcentral gyrus surface is less than that of the precentral gyrus surface, as seen in the axial or sagittal planes. Identifying tw...
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Third mogul sign

The third mogul sign can be seen on frontal chest radiograph in the presence of left atrial enlargement. It refers to an extra mogul or bump along the upper left cardiac silhouette just below the left main bronchus. The third mogul sign commonly represents the enlarged left atrial appendage, pa...
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Thoracic spine sign (ultrasound)

The thoracic spine sign on lung ultrasound is an indirect indicator of the presence of a pleural effusion or hemothorax. It represents the visualization of the vertebral bodies in the thoracic cavity above the diaphragm which are usually not seen unless there is a fluid collection.  Radiographi...
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Thoracoabdominal sign

Thoracoabdominal sign, a variation of the silhouette sign, is a frontal chest radiograph sign which helps to localize a thoracic lesion. Since the posterior costophrenic sulcus is more caudal than the anterior lung, a thoracic lesion must be posterior if its caudal end is visible below the dome...
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Threads and streaks sign

The threads and streaks sign refers to an angiographic appearance of a vascularized tumor thrombus extending into the ipsilateral renal vein or the inferior vena cava from a renal cell carcinoma. This gives an appearance of linear, thread-like or string-like appearance of the involved vessel.  ...
Article

Three line sign (common bile duct)

The three line sign refers to an MRI term that describes the appearance of roundworm Ascaris lumbricoides within the CBD lumen which appears as two hypointense lines representing the worm walls and hyperintense center which represents the worm gut. See also biliary ascariasis
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Throckmorton sign (pelvis)

Throckmorton sign, also known as John Thomas sign, refers to when the penis points in the direction of unilateral disease, typically of the pelvis or hip.  Throckmorton sign is a slang term used humorously by medical students and residents. According to the first serious study of the sign publ...
Article

Thrombus fissuration

Thrombus fissuration is a sign of impending rupture of an aortic aneurysm. It reflects blood dissecting into the intramural thrombus. This sign is observed on contrast-enhanced CT as linear contrast infiltrations from the aneurysm lumen through the intramural thrombus. Thrombus fissurations exte...
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Thumbprinting

Thumbprinting is a radiographic sign of large bowel wall thickening, usually caused by edema, related to an infective or inflammatory process (colitis). The normal haustra become thickened at regular intervals appearing like thumbprints projecting into the aerated lumen. Pathology Etiology Th...
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Thumb sign (chordoma)

The thumb sign or thumbing of the pons is described in chordomas as is meant to be relatively specific. It is seen in midline sagittal projection as a projection of the tumor indenting the pons 1,2. See also thumb sign (disambiguation)
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Thumb sign (disambiguation)

The term thumb sign is used to refer to a number of separate radiological appearances, including:  thumb sign (Marfan disease) - a clinical sign thumb sign (epiglottitis) thumb sign (chordoma)
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Thumb sign (epiglottitis)

The thumb sign in epiglottitis is a manifestation of an edematous and enlarged epiglottis which is seen on lateral soft-tissue radiograph of the neck, and it suggests a diagnosis of acute infectious epiglottitis. This is the radiographic corollary of the omega sign 1-3. See also Thumb sign is ...
Article

Thurstan Holland fragment

The Thurstan Holland fragment also known as the Thurstan Holland sign is an eponymous radiological sign depicting a triangular portion of the metaphysis remaining with the epiphysis in a physeal fracture. This fragment is one of the tell-tale signs of a type 2 Salter-Harris fracture 1. History ...
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Thymic notch sign

The thymic notch sign represents the normal thymus in a newborn on a frontal chest radiograph. Interruption of the cardiac silhouette forms a notch, which may be seen on either side, but more frequently is seen on the left side. 

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