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Tilted telephone receiver sign

The tilted telephone receiver sign (TTRS) has been described as a specific imaging feature of PHACES syndrome in fetal MRI 1 On the coronal plane, the TTRS sign is described as: upward displaced unilateral hypoplastic cerebellar hemisphere; asymmetric dilated 4th ventricle connected to as ips...

Exclamation mark sign (limy bile)

The exclamation mark sign is a pathognomonic imaging sign of the rare diagnosis of limy bile on plain abdominal radiography. It occurs when there is both limy bile and a gallstone in the common bile duct. The linear vertical radiopaque bile forms the line of the exclamation mark (i.e. !), whilst...

Marching cleft sign (meniscus)

The marching cleft sign is a finding on sagittal MR images, which is useful in characterizing the configuration of meniscal tears. It is present when a meniscal tear is oriented obliquely in relation to both coronal and sagittal plane, which results in the tear cleft moving towards or away from ...

Posterior wall sign (femoroacetabular impingement)

Posterior wall sign is a radiographic sign used to assess the morphology of posterior acetabular wall. A deficient posterior acetabular wall is often associated with acetabular retroversion or acetabular dysplasia, while a too-prominent posterior acetabular wall is a predisposing factor for post...

Milky Way sign (of PML)

The Milky Way sign, also known less memorably merely as the punctate pattern, is an MRI feature described in progressive multifocal leukoencephalopathy (PML) and is particularly useful when distinguishing this from new lesions of multiple sclerosis 1,2. Terminology Although the term "Milky Wa...

Color bruit artifact

The color bruit or tissue vibration artifact is a type of color Doppler ultrasound artifact which results in color signal overflowing to the perivascular tissues most often caused by stenosis, AV fistulas, or shunts. Thus, this artifact is useful by pinpointing areas of potentially pathological ...

Halo sign (osseous)

The halo sign in bone imaging refers to the presence of a hyperintense rim around an osseous lesion on T2-weighted MRI, which is highly suggestive of a metastatic lesion, rather than a primary malignancy 1.

Cheerio sign (disambiguation)

The Cheerio sign has been described in two different scenarios: Cheerio sign (pulmonary nodule) Cheerio sign (shoulder)

Tadpole sign

The tadpole sign, also known as the lollipop sign, refers to a characteristic morphology of post-traumatic bridging vein thrombosis with a rounded "head" and a tapering "tail". The finding demonstrates a high specificity for abusive head trauma, a sub-type of non-accidental injury, and should wa...

Step-off sign

The step-off sign is the radiographic appearance of Lisfranc injury on lateral projections of the foot when there is a dorsal displacement of the second metatarsal base. At the tarsometatarsal joint level, this displacement interrupts an imaginary line drawn on the dorsal surface of the foot 1-6...

Fleck sign (disambiguation)

The radiographic fleck sign refers to an avulsion fracture in the lower limb at either of two sites: fleck sign (ankle) due to superior peroneal retinaculum injury fleck sign (foot) due to Lisfranc injury

Spectral broadening (ultrasound)

Spectral broadening is an important artifact in pulsed wave Doppler ultrasound imaging, due to its clinical relevance as a sign of vessel stenosis. Physics Spectral broadening is caused by turbulence in blood flow as the normally homogeneous velocity of reflective red blood cells becomes more...

Small heart sign

The small heart sign represents a rarely encountered but critical sign on chest caused by a sudden reduction of heart size caused by cardiac tamponade due to either tension pneumopericardium or pneumomediastinum. A sudden, >2 cm reduction in the transverse cardiac diameter is considered highly...

Floating balls sign

The floating balls sign refers to the appearance of multiple mobile globules/spherules of solid, usually fatty, tissue within an adnexal cyst. It is pathognomonic for ovarian mature cystic teratoma 1,2. Terminology Alternative names include the meatballs 3, truffle sign 4, and boba sign 13. ...

Chen sign

Chen sign on chest radiography is the prominence of the left basal pulmonary vasculature, compared to the right, seen in valvular pulmonary stenosis. It is due to the asymmetric increase in pulmonary blood flow to the left lung due to preferential blood flow into the left pulmonary artery after ...

Fallen contrast sign

The fallen contrast sign refers to a trace of concentrated contrast material layering along the dependent left atrial wall during contrast-enhanced cardiac CT, suggestive of a right-to-left shunt. The finding has primarily been described as an indirect sign in sinus venosus atrial septal defect ...

Cerebral paragonimiasis

Cerebral paragonimiasis refers to brain infection with a specific genus of flukes and is a serious manifestation of paragonimiasis, which is primarily a lung disease caused by trematodes of the genus Paragonimus. Epidemiology Paragonimiasis is endemic in Asia, West Africa, and Latin America. I...

Molar tooth sign (disambiguation)

The molar tooth sign may refer to: molar tooth sign (CNS) molar tooth sign (abdomen)

Whirlpool sign (testicular torsion)

The whirlpool sign of the spermatic cord is a direct sign of testicular torsion, both complete and incomplete (i.e. <360°). It is considered to be the most specific and sensitive sign for testicular torsion. Terminology The term whirlpool sign is used in other contexts: see whirlpool sign (dis...

Scimitar (disambiguation)

The term scimitar, referring to the characteristic shape of the Middle Eastern sword, may refer to the following: scimitar syndrome (lungs) scimitar sign (cystic adventitial disease) scimitar sacrum (bones)

Pseudo-Rigler sign

The pseudo-Rigler sign is an important form of pseudopneumoperitoneum, and a mimicker of the classic Rigler (double wall) sign, that can be encountered normally on abdominal radiographs. Radiographic features The pseudo-Rigler sign can result from omental or mesenteric fat, or oral contrast me...

Apple core sign (disambiguation)

The apple core sign has been described in two different pathologies: apple core sign (colon) apple core sign (femur)

Sagging rope sign (Perthes disease)

The sagging rope sign is a thin sclerotic line that crosses the femoral neck and resembles a hanging or sagging rope that is suspended on both ends. This sign is seen in late stage of Perthes disease on plain radiographs of the hip or pelvis. This sign is thought to indicate damage to the growt...

Double skull sign (cephalohematoma)

The double skull sign is an eggshell calcification seen on CT in early cases of calcified cephalohematomas.

Ataxia (clinical sign)

Ataxia denotes the impaired coordination of voluntary muscle function. It is not a specific disease, but a clinical sign that can have diverse etiologies. It is typically caused by either cerebellar damage or impaired vestibular or proprioceptive afferent sensory input to the cerebellum. Clinic...

Starry sky appearance (disambiguation)

Starry sky appearance is a radiological sign used to describe the appearance of the liver on two different imaging modalities: starry sky appearance (ultrasound) starry sky appearance (MRI) starry sky artifact (MRI)

Caput medusae sign (disambiguation)

The caput medusae sign may refer to: caput medusae sign (portal hypertension) caput medusae sign (developmental venous anomaly) History and etymology Caput is the Latin for head, and the sign literally translates as head of Medusa 3. The appearance is reminiscent of the hair of Medusa, one ...

Corkscrew sign (disambiguation)

Corkscrew sign can refer to: corkscrew sign (corkscrew cochlea) corkscrew sign (diffuse esophageal spasm) corkscrew sign (midgut volvulus) corkscrew sign (ureteric tuberculosis)

Brahma bull sign

The Brahma bull sign (or Brahman) describes the appearance of the femoral neck when an osteochondroma is present, as Brahma bulls have an odd, camel-like hump along the dorsum of their neck resembling a femoral neck osteochondroma. Osteochondromas of the femoral neck, particularly when sessile, ...

Retrocardiac sail sign

The retrocardiac sail sign represents the characteristic and highly specific appearance of left lower lobe collapse on a frontal chest x-ray. Radiographic appearance The collapsed, medially displaced left lower lobe is represented by a triangular area of increased density with sharp margins, s...

Congenital hallux valgus

Congenital hallux valgus is a very rare finding wherein a fetus or newborn shows lateral deviation of the first toe(s). When found on prenatal imaging, bilateral congenital/foetal hallux valgus is highly suggestive of fibrodysplasia ossificans progressiva 1,2.

Reverse rim sign (kidney)

The reverse rim sign describes relative hypoenhancement of the renal cortex and normal enhancement of the renal medulla on contrast-enhanced CT and MRI. This enhancement pattern can also be visualized using CEUS 2. It is a typical finding of renal cortical necrosis that may occur in the setting...

Tit sign (pyloric stenosis)

The tit sign of pyloric stenosis is seen on barium studies as an outpouching of the lesser curve of the stomach proximal to the impression of the hypertrophied pyloric muscle. It represents the transient trap of contrast medium between a peristaltic wave and the thickened, hypertrophied pyloric...

Starry sky appearance (MRI)

Starry sky appearance on MRI refers to the appearance of small innumerable T2 hyperintense bile duct hamartomas and biliary microhamartomas, scattered throughout the T2 hypointense hepatic parenchyma, which resembles a “starry sky”. The high T2 signal lesions represent Von Meyenburg complexes se...

Salted pretzel sign (CT head)

The salted pretzel sign is an uncommon sign of the presence of numerous small (<3 mm) calcific foci in the distal branches of a cerebral artery on non-contrast CT head that represent a shower of calcified cerebral emboli 1. Cerebral calcified emboli may be the initial manifestation of significan...

Schwartze sign

The Schwartze sign, also known as flamingo flush sign or rising sun sign, is the otoscopic sign of active otospongiosis characterized by reddish discolouration of the cochlear promontory. History and Etymology The sign is named after German otologist Hermann Schwartze (1837 -1910), whose work ...

Ependymal dot-dash sign

The ependymal dot-dash sign has been described as an early MRI imaging feature of multiple sclerosis before other more florid white matter changes (e.g. Dawson's fingers) become evident 1. It has also been suggested as a feature that can be used to distinguish multiple sclerosis from neuromyelit...

Yo-yo on a string sign - Stener lesion

The yo-yo on a string sign denotes the characteristic appearance of the torn, proximally retracted and superficially displaced ulnar collateral ligament (UCL) due to a Stener lesion. Mechanism The sign occurs as a consequence of the tear of the ulnar collateral ligament of the thumb (gamekeepe...

Falling snow sign (spermatocele)

The falling snow sign describes the appearance of movement of internal echoes in spermatoceles away from the transducer, resulting in an appearance similar to falling snow when color Doppler is applied. The sign can be used to aid in the diagnosis of a spermatocele.

Astronomical inspired signs

Many signs in radiology have been inspired by astronomical phenomena: comet tail (disambiguation) comet tail artifact (ultrasound) color comet tail artifact comet tail sign (chest) comet tail sign (phleboliths) earth-heart sign galaxy sign (chest) loss of half-moon overlap sign milky wa...

Central vein sign

The central vein sign is a marker for multiple sclerosis (MS) and is the imaging manifestation of the perivenular nature of demyelinating plaques. It is not pathognomonic but can be useful in helping differentiate multiple sclerosis from mimics, such as cerebral small vessel disease, neuromyelit...

Mulder sign

Mulder sign is a clinical test used to examine causes of metatarsalgia associated with Morton neuroma. It has high specificity (100%) but relatively low sensitivity (62%) 2. See the ultrasound correlate described separately: sonographic Mulder sign. Technique With one hand, clasp the metatarsa...

Sonographic Mulder sign

The sonographic Mulder sign is the ultrasound correlate of the clinical Mulder sign during examination of the forefoot to investigate causes of metatarsalgia associated with Morton neuroma 1. The intermetatarsal space is predominantly composed of fat inferiorly and also contains the neurovascula...

Torricelli-Bernoulli sign

The Torricelli-Bernoulli sign denotes nondependent air trapped in a necrotic ulcer in a gastrointestinal tumor seen on axial CT or MRI. Occasionally, a vertical stream of bubbles can be seen issuing from the orifice of the ulcer. Terminology Torricelli's theorem gives the relation of the veloc...

Cluster sign

The cluster sign is a finding on MRI and CT that is associated with pyogenic hepatic abscesses and can help differentiate pyogenic abscesses from other types of liver lesions. Radiographic features The cluster sign is best seen on MRI T2-weighted and postcontrast T1-weighted sequences. Small n...

Periwinkle sign (supratentorial ependymoma)

The periwinkle sign has been coined to describe what has been claimed to be a characteristic appearance of intraparenchymal supratentorial ependymomas on non-enhanced CT axial images. The central solid component sometimes demonstrates centripetal calcification surrounding the central necrotic c...

Turtle sign (fetal shoulder dystocia)

Turtle sign is a clinical sign of fetal shoulder dystocia in which the fetal head retracts 3. The head bobbing, emerging and then pulling back could be conceptualised as similar to a turtle pulling its head into and out of its shell. The sign does not necessarily signify true shoulder dystocia 2.

Medial breast margin sign

The medial breast margin sign is a sign of pectus excavatum seen on the frontal chest radiographs of women. It is one of several described signs of pectus excavatum on frontal chest radiographs. Radiographic features Plain radiograph Women with pectus excavatum may have a more vertically ori...

Concentric target sign (cerebral toxoplasmosis)

The concentric target sign is a typical sign for cerebral toxoplasmosis. It is seen on T2 weighted MR imaging as a deep parenchymal lesion showing a series of concentric rings with hyperintense and hypointense/isointense signal alternatingly. Strong perifocal edema is usually visible on T2/FLAIR...

Cingulate island sign

The cingulate island sign is a highly specific radiological sign described in dementia with Lewy bodies. It refers to the pattern of metabolism seen on FDG-PET in patients with dementia with Lewy bodies 1-3. On FDG-PET, there is occipital hypometabolism with relative sparing of the posterior ci...

Halberd pelvis

A halberd pelvis refers to a pathognomonic appearance of the pelvis seen in metatropic dysplasia, a rare form of spondyloepimetaphyseal dysplasia. hypoplastic ilia with narrow sacrosciatic notches horizontal acetabular roofs with small associated notches superior to their lateral borders prom...

Ball on tee sign (kidney)

The ball-on-tee sign, golf ball-on-tee sign, or egg in cup appearance, refers to a urographic pattern of papillary excavation that may be seen with renal papillary necrosis. The sign occurs when contrast material fills central excavations in the papilla of the interpolar region giving a ball-on...

Crossover sign (femoroacetabular impingement)

The crossover sign, also known as the 'figure of 8' sign, is a plain film sign that indicates acetabular retroversion 2. Acetabular retroversion is a form of pincer morphology and predisposing factor for femoroacetabular impingement and is thought to promote osteoarthritis of the hip 3. Radiog...

Dense vein sign

The dense vein sign refers to hyperattenuating thrombus within a cortical vein or dural venous sinus due to acute venous thrombosis. When located in the superior sagittal sinus, particularly posteriorly, it is sometimes referred to as the delta, triangle or pseudodelta sign. It is really the sa...

Bunny waveform sign

Bunny waveform sign refers to the biphasic morphology of the pulsed wave Doppler spectral waveform in the vertebral artery in early (occult/latent or partial) subclavian steal phenomenon (sometimes called a "presteal" state, before it progresses to frank flow reversal). There is a sharp decelera...

Spider web appearance

Spider web appearance is a classic appearance seen on venography in a patient with hepatic venous outflow obstruction. It refers to the dense network of hepatic venous collaterals seen.

Leaping dolphin sign

The leaping dolphin sign (also known as the diaphragm muscle slip sign) may be seen in pneumoperitoneum on a supine abdominal radiograph. It represents the outlining of the diaphragmatic muscle slips by free intraperitoneal gas and usually requires a moderate to large volume of pneumoperitoneum ...

Sunburst sign (disambiguation)

The evocative appearance of a sunburst has inspired several signs: sunburst appearance (bone) sunburst sign (meningioma) sunburst sign (renal angiomyolipoma)

Comet tail (disambiguation)

The distinctive appearance of a comet's tail has been used for several signs: comet tail artifact (ultrasound) color comet tail artifact comet tail sign (chest) comet tail sign (phleboliths)

Flame sign (spinal cord metastasis)

The flame sign has been described as a helpful MRI sign of spinal cord metastases, enabling them to be distinguished from other enhancing spinal cord lesions (e.g. ependymoma, astrocytoma and hemangioblastoma) 1. Radiographic features MRI The flame sign is seen on sagittal post contrast T1 w...

Rim sign (spinal cord metastasis)

The rim sign has been described as a helpful MRI sign of spinal cord metastases, enabling them to be distinguished from other enhancing spinal cord lesions (e.g. ependymoma and astrocytoma). Radiographic features MRI The rim sign is seen on sagittal post contrast T1 weighted imaging of the s...

Giraffe pattern

Giraffe pattern (also known as the pseudonodular appearance) is a distinctive ultrasound appearance characteristic of Hashimoto thyroiditis. Bonavita originally described a thyroid gland with multiple echogenic nodules, separated from one another by bands of hypoechogenicity, reminiscent of a gi...

Potato nodes

Potato nodes are a classical moniker for the large nodes seen in the lung hila and mediastinum on the chest radiograph in pulmonary sarcoidosis. This name is derived from the characteristic bulky irregular morphology of the nodes which is reminiscent of large lumpy potatoes. Although this appear...

Cluster of black pearls sign

The "cluster of black pearls" sign refers to a finding on contrast-enhanced CT useful in differentiating sarcoidosis from other causes of lymphadenopathy such as tuberculosis, lymphoma and metastatic adenocarcinoma. The sign is depicted by the presence of multiple tiny round nodules (1-2 mm) di...

Boomerang sign (disambiguation)

Boomerang sign may refer to: boomerang sign (peroneus brevis tear) boomerang sign (medial meniscal tear) boomerang sign (splenium) History and etymology Boomerang is of course a curved projectile used originally by the Australian Aborigines, one of its various uses was as a hunting weapon 1.

Empty cyst sign

The empty cyst sign is described in hydatid disease. After rupture of the cyst and complete evacuation of its content, the pericyst becomes empty as an air-filled cyst on x-ray or CT 1,2. With superadded infection, an air-fluid level may appear within the cyst, mimicking a lung abscess 2.

Crescent sign (lung hydatid)

The crescent sign is described in hydatid disease. When the hydatid cyst erodes the adjacent bronchus or bronchiole, the trapped air between the pericyst and the laminated membrane of the endocyst gives a crescent-shaped rim of air around the cyst, thus is termed the crescent sign 1,2. It can b...

Serpent sign

The serpent sign, a.k.a. snake sign, is described in hydatid disease. The WHO classification (2001) or Gharbi classification (1985) of hydatid disease describe several stages on ultrasound 1. During the active stage, the cyst is composed of three layers: the outer (pericyst), the middle (ectocy...

Egg and banana sign (pulmonary hypertension)

The egg and banana sign is a sign for the diagnosis of pulmonary arterial hypertension (PAH) on axial CT/MR images. It refers to the appearance of the aortic arch (banana) next to a distorted main pulmonary artery (egg). Like an egg, the main pulmonary artery is preferentially dilated in the PA ...

Tangent sign

The tangent sign is useful in helping to quantify supraspinatus muscle belly fatty atrophy with a positive sign implicated with a poorer outcome after supraspinatus tendon tear repair. On a sagittal oblique plane, a line is drawn between the upper surface of the scapular spine and the upper sur...

Arc sign (CARASIL)

The arc sign has been described in late-stage CARASIL and is seen on axial T2 weighted images. It describes high signal extending from one middle cerebellar peduncle, across the pons, to the contralateral middle cerebellar peduncle 1.

Pyrexia

Pyrexia (or fever) is a clinical sign, indicated by an abnormally elevated core body temperature, which is defined by several medical societies as ≥38.3°C (≥≈101°F). The temperature elevation may be persistent or episodic. If the body temperature is greater than 41.5°C - a rare phenomenon - it i...

Doughnut sign (disambiguation)

The doughnut sign can refer to various imaging appearances: crescent in a doughnut sign (bowel) doughnut sign (bone scan) doughnut sign (bowel) doughnut sign (chest) doughnut sign (missed testicular torsion) doughnut sign (orbit)

Celery stalk (disambiguation)

Celery stalk appearance can refer to the following: celery stalk anterior cruciate ligament celery stalk metaphysis

Trident appearance (disambiguation)

The trident appearance (or sign) can refer to a variety of entities: trident acetabulum trident hand trident sign (osmotic demyelination) trident sign (persistent trigeminal artery) History and etymology The trident is a three-pronged lance employed for spearing fish, and in Classical myth...

Hockey stick sign (disambiguation)

The hockey stick sign can refer to a variety of different signs and appearances: hockey stick sign (thyroid hemiagenesis) hockey stick sign (Creutzfeldt-Jakob disease) hockey stick sign (ureters)

De Winter pattern (electrocardiogram)

An electrocardiographic finding suggestive of impending myocardial infarction, the de Winter's pattern (or "de Winter's T-waves") describes an abnormality thought to be indicative of acute occlusion of the proximal left anterior descending coronary artery (LAD) 2. Timely recognition of this patt...

Jellyfish sign (ultrasound)

The jellyfish sign refers to the sonographic appearance of atelectatic lung "swimming" within a large pleural effusion. The mobility of the lung within pleural fluid implies an absence of lung consolidation and the absence of pleural adhesions 1. It is also suggestive of a transudative pleural e...

Round belly sign (abdominal compartment syndrome)

Round belly sign is a sign of increased abdominal pressure of greater than 20 mmHg in abdominal compartment syndrome where the abdomen has a rounded appearance of transverse section on CT, rather than its typical oval shape. The sign is positive when the AP to transverse diameter of the abdomen...

Ginkgo leaf sign (disambiguation)

The ginkgo leaf sign can refer to: ginkgo leaf sign (chest) of chest wall surgical emphysema ginkgo leaf sign (spine) of spinal meningioma

String of pearls sign (ovary)

The string of pearls (or beads) sign in the ovary is the ultrasound sign of multiple small (<5 mm) follicles peripherally located in the gonad. It is typically seen in polycystic ovaries, and is thought to represent abnormal accumulation of immature follicles. This morphologic appearance howeve...

Deep sulcus sign (disambiguation)

The deep sulcus sign can refer to two different radiographic signs but is best known in the chest: deep sulcus sign (chest): of pneumothorax on supine CXR: deep sulcus sign (knee): better known as the lateral femoral notch sign of ACL injury

Antler sign (lung)

The antler sign is an uncommon sign of lung torsion on CT where branches from the main pulmonary artery all arise from a single side, indicating twisting of the lobe or lung. In the normal lung, the main pulmonary arteries are straight and lobar and segmental branches arise from it on both side...

Pericardial fat tag sign (pneumothorax)

The pericardial fat tag sign is a sign of pneumothorax on supine CXR where the cardiac border has a lumpy contour. When gas is located in the pleural space between the lung and mediastinum, the pericardial fat is no longer compressed against the mediastinum and therefore can hang or dangle late...

Charcot triad

Charcot triad is the finding of pyrexia, right upper quadrant pain and jaundice, and is a traditional clinical sign of acute cholangitis. A meta-analysis of 4288 patients in 16 studies found that the sensitivity of Charcot triad for acute cholangitis was poor (36.3%) with a much better specific...

60/60 sign (echocardiography)

The 60/60 sign in echocardiography refers to the coexistence of a truncated right ventricular outflow tract acceleration time (AT <60 ms) with a pulmonary arterial systolic pressure (PASP) of less than 60 mmHg (but more than 30 mmHg). In the presence of right ventricular failure, it is consisten...

Plankton sign (ultrasound)

The plankton sign refers to swirling, punctiform internal echoes within an otherwise anechoic pleural effusion which demonstrate slow, whirling dynamics, occasionally buffered by cardiac and respiratory impulses. When present, one may rule out a transudative effusion, and should be highly suspic...

Barbell sign (progressive multifocal leukoencephalopathy)

The barbell sign has been described in a short series of patients with progressive multifocal leukoencephalopathy (PML) 1. This describes confluent FLAIR / T2W parieto-occipital abnormalities with a thin continuation of signal abnormality across the splenium. Given the lack of mass effect typi...

Hurley stick ureters

Hurley stick ureters refers to the widening of the distal ureters with abnormal lateral and upward curvature instead of normal oblique intramural course in excretory urogram. The appearance of distal ureter resembles hurley stick used in the traditional Irish game of hurling. This is seen in bla...

Ears of the lynx sign (brain)

The ears of the lynx sign refers to abnormal T2/FLAIR cone-shaped hyperintensity at the tip of the frontal horn of the lateral ventricles in the region of forceps minor which resembles the tufts of hair crowning the ears of a lynx. This sign is seen in hereditary spastic paraplegia with thin co...

Dog ear sign (abdomen)

The dog ear sign represents the presence of fluid or blood in the pelvic peritoneal recess on a supine abdominal radiograph. The appearance of the sign comes from a convex soft-tissue density representing fluid or blood in the lateral pelvic peritoneal recess separated from the bladder by a thin...

Hairy kidney sign (Erdheim-Chester disease)

The hairy kidney sign refers to the soft tissue ring of perirenal infiltration seen on cross-sectional imaging studies in Erdheim-Chester disease and is considered to be pathognomonic of this disease. The ‘‘hairy’’ description refers to the associated thickening of the bridging perirenal septa (...

Peritoneal stripe sign (pneumoperitoneum)

The peritoneal stripe sign in abdominal ultrasonography is considered indicative of intraperitoneal free air, present in pneumoperitoneum. Free air in the abdomen will collect in an anti-dependent manner, typically the anterior prehepatic space in the supine patient, settling against the parieta...

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