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Gastro-esophageal reflux grading

Gastro-oesophagal reflux grading is based on the vertical height that contrast-media reaches during fluoroscopy 1: grade I: reflux in the distal esophagus grade II: reflux up to or just above the carina grade III: reflux into cervical esophagus grade IV: reflux in the cervical esophagus with...

Gastrosplenic fistula

A gastrosplenic fistula is a very rare type of gut fistulation that can occur as a complication with either a gastric or splenic lesion. Pathology Etiology Recognized causes include lymphoma (considered commonest cause) most commonly diffuse large B-cell lymphoma (DLBCL) usually in context...

Anal columns

The anal columns, also known as columns of Morgagni are a number of longitudinal folds of the anal mucosa. The columns unite inferiorly to form crescentic shaped anal valves. Shallow clefts of mucosa are formed in between the columns and valves, termed the anal sinuses. The anal valves form a c...

Pancreatoduodenal space

The pancreaticoduodenal space (PDS) or groove (PDG) is a small anatomical potential space between the pancreatic head and duodenum 1. Gross anatomy Boundaries medial: pancreatic head lateral: 2nd portion of duodenum superior: duodenal bulb inferior 3rd portion of duodenum posterior: infer...

APUD cells

APUD (Amine Precursor Uptake and Decarboxylation) cells include a wide range of endocrine cell types scattered throughout the body, such as the respiratory system, gastroenteropancreatic system, reproductive system, thyroid gland, pancreatic islets, adrenal medulla, carotid body, kidney, pituita...

Perianal genital warts

Perianal genital warts, also known as condyloma acuminata (singular: condyloma acuminatum), are a complication of human papillomavirus (HPV) infection. They are diagnosed clinically and are usually painless and benign, but can rarely undergo malignant transformation into squamous cell carcinoma....

Eckhardt score

The Eckhardt score is a clinical scoring system commonly used to characterize the severity of achalasia. It is a 12-point score which is as follows: recent weight loss (kg) none = 0 <5 kg = 1 5-10 kg = 2 >10 kg = 3 dysphagia none = 0 occasional = 1 daily = 2 each meal = 3 retrosterna...

Tertiary esophageal contractions

Tertiary esophageal contractions are a type of contractions of the esophagus often described as as the irregular contraction or indentations of the distal esophageal wall. Isolated tertiary esophageal waves of the non-repetitive type are thought to occur in normal subjects. Swallowing induced re...

Disseminated histoplasmosis

Disseminated histoplasmosis, also known as progressive disseminated histoplasmosis, is a severe form of histoplasmosis infection typically seen in immunosuppressed patients, especially in the setting of HIV infection. It results from hematogenous dissemination of the infection, involving multipl...

Esophageal MRI

Esophageal MRI, or gastro-esophageal junction (GEJ) MRI, is a targeted mediastinal imaging protocol performed to stage and aid treatment decisions in esophageal and GEJ carcinoma. It is not yet included in major treatment guidelines, but recent literature have pointed promising accuracy compared...

Median arcuate ligament

The median arcuate ligament is a fibrous arch connecting the left and right diaphragmatic crura at the aortic hiatus 1,2. A low-lying median arcuate ligament can compress the celiac axis to cause celiac artery compression syndrome which is also known as median arcuate ligament syndrome (MALS) 2.

Pseudosacculation

Pseudosacculations (also known as pseudodiverticulae) are outpouchings of normal bowel wall along the antimesenteric border. Inflammation and fibrosis along the mesenteric border of the bowel loop causes asymmetric shortening of the mesenteric wall, and subsequent pseudosacculations of the norma...

Cholecystocutaneous fistula

Cholecystocutaneous fistulas are abnormal fistulous connection between the gallbladder and the skin. It is a rare form of gastrointestinal fistulation and may result from a complication of cholecystitis, gallbladder carcinoma, or percutaneous procedures 1,2. Epidemiology The peak incidence is ...

Omphalomesenteric duct

The omphalomesenteric duct, also called the vitelline or vitellointestinal duct, is a communicating tract between the embryonic yolk sac and the primitive midgut. This duct is obliterated at around the 5th to 8th week of gestation. Approximately 2% of people have a failure of involution. Relat...

Component separation index

The component separation index is a value used to quantify the degree of diastasis of the rectus abdominis muscles in the context of anterior abdominal wall hernias. Usage The mode of repair of midline abdominal wall hernias (often incisional hernias through laparotomy wounds) depends on the d...

Paris Classification of inflammatory bowel disease

The Paris Classification of inflammatory bowel disease is used to classify the severity of ulcerative colitis and Crohn disease in the pediatric population. Primary differences between the adult and pediatric phenotype include the location, behavior, propensity for disease extension as well as i...

White line of Toldt

The white line of Toldt is a line formed at the junction of the lateral reflection of the posterior parietal peritoneum and the visceral peritoneum of the colon in the paracolic gutter. This represents an avascular plane used to mobilize the right and left hemicolon during hemicolectomy and is ...

Montreal classification of inflammatory bowel disease

The Montreal Classification of inflammatory bowel disease is used primarily to classify the severity of ulcerative colitis and Crohn disease based on specific categories. This can then be used to guide treatment, discern risk of complications as well as facilitate epidemiological studies 1. The...

Centrifugal (inside-out) enhancement of liver hemangioma

Centrifugal (inside-out) enhancement of liver hemangioma are a type of atypical hepatic hemangioma, which due to its imaging features, often raises the concern of a malignant process rather than a benign one. Epidemiology Centrifugal (inside-out) enhancement of liver hemangiomas are a relativ...

Gastric neuroendocrine tumor

Gastric neuroendocrine tumors (GNETs), previously known as gastric carcinoids, are rare primary neoplasms that arise from enterochromaffin-like cells of the gastric mucosa. Epidemiology GNETs account for less than 2% of all gastric neoplasms and up to 10% of all gastrointestinal neuroendocrine...

Inflammatory fibroid polyp - gastrointestinal tract

Inflammatory fibroid polyps (IFP's) are rare, benign lesions of the gastrointestinal tract, most commonly affecting the gastric antrum, followed by small bowel, and large bowel 1. Rarely it occurs in rectum, esophagus or gall bladder 1. Epidemiology The tumor is most commonly found in in patie...

Adenosquamous carcinoma of the pancreas

Adenosquamous carcinoma of the pancreas is a rare, highly aggressive malignancy, clinically indistinguishable from the more common pancreatic ductal adenocarcinoma. Their defining pathological and imaging characteristics are the frequent presence of central necrosis and vascular invasion. Termi...

Thoracic splanchnic nerves

The thoracic splanchnic nerves are three paired autonomic nerves that provide sympathetic innervation of the abdominopelvic viscera and vessels. They contain efferent and afferent fibers. Gross anatomy Three pairs of thoracic splanchnic nerves arise from the T5 to T12 sympathetic ganglia. Gre...

Hepatic plexus

The hepatic plexus (plural: plexuses) is an autonomic nerve plexus and ganglia located in the upper abdomen. Most descriptions are of a periarterial extension of the celiac plexus along the common hepatic artery and portal vein. Summary location: the plexus and ganglia extends to the right fr...

Celiac plexus

The celiac plexus (plural: plexuses) is an autonomic nerve plexus and ganglia in the upper abdomen. It is the largest major autonomic plexus. Summary location: the ganglion and plexus lie close to the celiac trunk origin: preganglionic sympathetic fibers via the greater and les...

Ganglion impar

The ganglion impar, also know as the ganglion of Walther, is the midline autonomic ganglion located in the lower pelvis. It is the most distal convergence of the pelvic sympathetic chain which is usually located anterior to the coccyx. It can be found anywhere between the sacrococcygeal joint a...

Squeeze sign

The squeeze sign is a pathognomonic feature of a colonic lipoma, where the lesion is seen to change in size and shape upon compression. This can be demonstrated with a barium enema examination where a well-circumscribed, spherical filling defect will be seen to elongate during peristalsis 1,2. T...

Superior mesenteric plexus

The superior mesenteric plexus is an autonomic nerve plexus and ganglia located in the retroperitoneum. Summary location: the plexus and ganglia lie in the retroperitoneum at the origin of the superior mesenteric artery within the small bowel mesentery origin: formed from branches from ...

Inferior mesenteric plexus

The inferior mesenteric plexus is an autonomic nerve plexus and ganglia located in the retroperitoneum. Summary location: the plexus and ganglia lie in the retroperitoneum at the origin of the inferior mesenteric artery origin: formed mainly from branches from the aorticorenal plexus some c...

Autonomic ganglia and plexuses

The autonomic ganglia and plexuses are a collection of ganglia where autonomic preganglionic neurons arising from the CNS synapse with postganglionic neurons outside the CNS, i.e. in the peripheral nervous system. Many of the ganglia contain nerves of the sympathetic and parasympathetic nervous ...

Normal imaging examples

This article lists examples of normal imaging divided by body region and system. brain head and neck spine chest breast gastrointestinal genitourinary hepatobiliary upper limb lower limb pediatrics

Traditional serrated adenoma

Traditional serrated adenomas are a type of premalignant serrated colonic polyp. Epidemiology They are thought to account for <1% of all colonic polyps and 1-7% of all serrated lesions. They tend to occur in older patients (usually over 50 years) with no significant gender predilection. Patho...

Acute esophageal necrosis

Acute esophageal necrosis, sometimes known as Black esophagus or esophageal stroke, is a rare entity characterized by patchy or diffuse circumferential black pigmentation of the esophageal mucosa from ischemic necrosis. It is classically characterized by a striking endoscopic image of diffuse, ...

Splenectomy

A splenectomy is the surgical removal of the spleen. This can be partial or total, however a partial splenectomy is rarely performed due to an increased risk of complications compared to a total splenectomy 1. Indications Indications for a splenectomy can be divided into absolute and relative ...

Decreased duodenal folds

Decreased duodenal folds may be seen on imaging modalities, particularly MR enterography, and differential diagnoses include: scleroderma - usually with duodenal dilatation celiac disease - particularly involves the distal duodenum and jejunum Crohn disease cystic fibrosis amyloidosis

Nontoxic megacolon

Nontoxic megacolon refers to colonic dilatation of more than 6 cm in an adult without mural abnormality. This is in contrast to toxic megacolon, an acute complication accompanied by mural abnormalities such as thickening, loss of haustral folds, pneumatosis or free gas. The differential diagnos...

Bowel wall fat deposition

Bowel wall fat deposition refers to the infiltration of the submucosa with fat and usually occurs in chronic processes such as inflammatory bowel disease, causing characteristic fat halo sign on CT images. Other differential diagnoses include: normal variant - particularly in obese patients w...

Bowel wall calcification

Bowel wall calcification is not common and can occur secondary to various mechanisms due to benign, premalignant, or malignant lesions. The differential diagnoses include: mucinous adenocarcinoma gastrointestinal stromal tumor (GIST) metastatic calcification - due to renal failure hemangio...

Esophageal balloon tamponade device

An esophageal balloon tamponade device is a form of balloon catheter designed to exert direct pressure on bleeding gastro-esophageal varices in order to obtain hemostasis. It is considered a temporizing measure in hemodynamically unstable patients in whom endoscopic (or angiographic) interventio...

Feces

Feces, also known as stool, is the solid component of human waste. Almost half of its dry mass is bacterial biomass, with the remainder comprised of undigested dietary matter, exfoliated cells of the gut, intestinal secretions, small metabolites and mucus. Composition Fecal matter is semisoli...

Gastrocolic fistula

A gastrocolic fistula (plural: fistulas/fistulae), also known as cologastric fistula, is a rare form of gut fistulisation between the stomach and the colon. Terminology Gastrocolic fistula, is much more common in the literature than its synonym cologastric fistula, which is in line with the co...

Pseudokidney sign (colonic carcinoma)

The pseudokidney sign is a non-specific sonographic sign that describes the reniform shape of a mass with a hypoechoic region (representing bowel wall thickening) surrounding a central hyperechoic portion or echogenic stripe (which represents the apposition of the mucosal surfaces) 1,2. It can...

Gastropancreatic fistula

A gastropancreatic fistula is a rare form of gut fistulation where there is a fistulous communication between the stomach and the pancreas. It has been described in association with chronic pancreatitis 1 / severe pancreatitis intraductal papillary mucinous neoplasm (IPMN) 4 peptic ulcers 2 ...

Hypoglycemia

Hypoglycemia describes an abnormally low blood glucose level (<4 mmol/L). It is a common clinical problem in diabetics overtreated with glucose lowering agents. Clinical presentation Signs of hypoglycemia include: dizziness tremors, palpitations and anxiety hunger sweating confusion fati...

Zebra sign (disambiguation)

The evocative appearance of the coat of a zebra has been used for several distinctive signs in radiology: zebra sign: cerebellar hemorrhage 1 zebra sign: amyotrophic lateral sclerosis 2 zebra spleen: arterial phase appearance of normal spleen 4,5 zebra stripe sign: treated osteogenesis imper...

Complications of radiation therapy

Radiation therapy has the potential to cause complications in many organ systems, many of which, especially in the thorax, are important for radiologists to be aware of. acute radiation syndrome complications of cranial radiation therapy radiation-induced cerebral vasculopathy radiation-ind...

Gastrointestinal stents

Gastrointestinal (GI) stents are increasingly used to treat obstruction of the GI tract, most commonly due to malignancy. Types of stent esophageal stent gastric stent duodenal stent enteric stent colorectal stent History and etymology Somewhat surprisingly the word 'stent' is actually a...

Glasgow-Blatchford score

The Glasgow-Blatchford score (GBS) is a widely-used and well-validated scoring system for upper GI bleeding and the need for intervention. Score The scoring system relies upon knowing the patient's urea, hemoglobin, systolic blood pressure, and several other criteria. Each criterion is scored,...

Colorectal cancer (TNM staging 7th edition)

The 7th edition of the TNM classification of colorectal carcinomas was proposed in 2010, and has now been updated and replaced by the 8th edition, published in 2016. Primary tumor staging (T) Tx: primary tumor cannot be assessed T0: no evidence of primary tumor Tis: carcinoma in situ T1: in...

Traction esophageal diverticulum

A traction esophageal diverticulum is a true esophageal diverticulum (i.e. includes all layers of the esophageal wall) which occurs secondary to external pulling/traction forces on the esophageal wall. Pathology Etiology pulmonary/mediastinal scarring or fibrosis inflammatory processes in th...

Scaphoid abdomen

Scaphoid abdomen is the term given to an inward concavity of the anterior abdominal wall. It is used both for the clinical appearance and its radiological equivalent. In children it maybe a sign of congenital diaphragmatic hernia. In both adult and pediatric patients, it raises the possibility...

N-butyl-2-cyanoacrylate pulmonary embolism

N-butyl-2-cyanoacrylate pulmonary embolism is a potentially life-threatening complication that can arise following the use of the tissue glue, butyl-cyanoacrylate, for endoscopic sclerotherapy to treat variceal bleeding. Epidemiology Sclerosis with biological glue (butyl cyanoacrylate) is curr...

Water-soluble contrast challenge

A water-soluble contrast challenge (more widely known as a Gastrografin challenge) is a combined diagnostic study and therapeutic intervention utilized in the evaluation and management of small bowel obstruction. It is used when clinical or imaging features determine there to be small bowel obst...

Pica

Pica refers to a psychiatric disorder in which patients report a craving for and compulsive consumption of substances that are not food. Substances consumed include earth, clay, plaster, paint chips, string, hair, animal feces and stones 1. Epidemiology Although the condition can present in a...

Congenital pouch colon

Congenital pouch colons are an anomaly in which there is cystic dilation of a shortened colon. They can either partially or totally replace the colon. Pathology Associations Congenital pouch colons can be associated with vaginal or vestibular fistulas and less frequently with other genitourin...

Sliding hiatus hernia

A sliding hiatus hernia or type 1 hiatus hernia is considered the most common type of hiatus hernia. They can be present to varying degrees and can also co-exist with other types (inclusive of a rolling hiatus hernia). Clinical presentation Many patients may have gastro-esophageal reflux. Some...

Timed barium esophagogram

The timed barium esophagogram (TBO) is a simple physiologic assessment and objective method for assessing the esophageal emptying used in patients with suspected achalasia and to evaluate and follow up patients who have been treated with myotomy or pneumatic dilatation1,3. Technique Several te...

Mackler's triad

Mackler's triad consists of the clinical symptoms of vomiting, followed by severe pain in the chest, usually retrosternal, lower thoracic, and upper abdominal, associated with subcutaneous emphysema detected on physical examination, which is suggestive of esophageal rupture (Boerhaave syndrome) ...

Anderson triad

The Anderson triad consists of the clinical findings of tachypnea and abdominal rigidity with lower thoracic or epigastric pain, associated with subcutaneous emphysema, which is usually related to esophageal rupture.

Subhepatic appendicitis

Subhepatic appendicitis refers to inflammation of the appendix in which the appendix and cecum have failed to descend inferiorly during normal development; resulting in a "subhepatic" position. Epidemiology Presentation of an inflamed subhepatic appendix is exceedingly uncommon, representing o...

Double beak sign

The double beak sign refers to the sudden tapering that two adjacent intestinal loops show in the internal hernia at the transition point of the closed loop obstruction. The marked reduction in caliber results in distension of the afferent and efferent intestinal loops. History and etymology I...

Crescent sign (disambiguation)

The characteristic shape of the crescent has been given to many radiological signs over the years: air crescent sign (aspergillosis) crescent in a doughnut sign (intussusception) crescent sign (arterial dissection) crescent sign (intravenous pyelogram) crescent sign (lung hydatid) crescent...

Intussusception (summary)

This is a basic article for medical students and other non-radiologists Intussusception occurs when a loop of bowel is pulled into the lumen of a distal bowel loop, and is an important cause of acute abdominal pain, particularly in young children. Reference article This is a summary article; ...

Corkscrew sign (diffuse esophageal spasm)

A corkscrew esophagus, also known as a rosary bead esophagus, is a classic appearance of distal esophageal spasm on a barium swallow. It is actually quite a rare appearance which is seen in <5% cases of distal esophageal spasm. The finding is caused by multiple tertiary (non-propulsive) contract...

Superficial epigastric vein

The superficial epigastric vein (TA: vena epigastrica superficialis) is an important tributary of the great saphenous vein that drains the anterior abdominal wall inferior to the level of the umbilicus. The superficial epigastric vein drains into the great saphenous vein at the saphenous openin...

Anal canal diverticulum

Diverticula of the anal canal are very rare with only a few cases reported in the global literature. Clinical presentation Patients have presented with anorectal bleeding and/or pain. Radiographic features The few cases have either not been characterized on imaging or only imaged on barium s...

Intramural pseudocyst

Intramural pseudocysts are a rare form of pancreatic pseudocysts that occur within the wall of the upper gastrointestinal tract. They may result in gastric outlet obstruction. Pathology Size They can considerably vary in size with one study reporting a range of 8 mm to 8 cm 1. Location Repo...

Bowler hat sign

The bowler hat sign refers to an appearance on a GI contrast study, which may be seen with both polyps and diverticula of the bowel. The filling defect produced by the pathology mimics the outline of a bowler hat. It was originally described for colonic lesions, but can be seen with lesions thro...

Cameron lesions

Cameron lesions refer to linear ulcers or erosions that occur on the mucosal folds at the diaphragmatic impression of a hiatus hernia. They are usually radiographically occult and diagnosed endoscopically (although still useful for a radiologist to know). Epidemiology Their prevalence has been...

Superior hypogastric plexus

The superior hypogastric plexus is an autonomic nerve plexus and ganglia located in the lower abdomen. Summary location: the plexus and ganglia lie anterior to the aortic bifurcation extending inferiorly between the common iliac arteries and along the left common iliac vein and median sacral v...

Clermont score

The Clermont or DWI-MaRIA scoring system is used to assess ileocolonic Crohn disease activity on noncontrast MRI enterography. It is based on the earlier Magnetic Resonance Index of Activity (MaRIA) index, however, it does not require intravenous gadolinium by substituting relative contrast enha...

Cholecystocolonic fistula

Cholecystocolonic fistulas are most commonly a rare late complication of gallstone disease, resulting from an abnormal communication between the gallbladder and the colon. It is the second most common cholecystoenteric fistula after cholecystoduodenal fistulas 1. Clinical presentation These m...

Magnetic Resonance Index of Activity (MaRIA)

The Magnetic Resonance Index of Activity (MaRIA) scoring system is used to assess ileocolonic Crohn disease activity on contrast-enhanced MRI enterography. The segmental index represents disease severity in one bowel segment, whilst assessing six defined anatomic regions these can be combined in...

Rectal MRI (an approach)

Rectal MRI is a key imaging investigation in the diagnosis, staging and follow up of rectal cancer. An increase in the utility of rectal MRI as been driven by the recognition of the mesorectum as a distinct anatomic compartment containing and limiting the margins of the rectum, and forming a sur...

Dolichocolon

Dolichocolon refers to an abnormally elongated redundant colon. It is considered a developmental variant. Clinical presentation The main symptoms and signs of dolichocolon are: constipation abdominal pain abdominal distension volvulus However, dolichocolon is a contentious entity, and so...

Interstitial cells of Cajal

The interstitial cells of Cajal are mesenchymal cells closely apposed to neural and smooth muscle cells of the gut. They form a heterogeneous group with differing ultrastructure and functions. One cell type has an ancillary neural function as a gastrointestinal pacemaker, generating electrical ...

Odynophagia

Odynophagia is the term given for painful swallowing. Pathology It can arise from a number of causes which include esophageal inflammation - esophagitis esophageal infection substernal dysphagia tonsillitis pharyngitis esophageal spasm See also dysphagia: difficulty swallowing.

Incompetent ileocecal valve

An incompetent ileocecal valve is a situation where there can be reflux of backward flow of food content from the large bowel (cecum) through to the small bowel (terminal ileum) and through the ileocecal valve. A low degree of incompetence is not an uncommon finding 3. In some states, patients m...

Sphincter (disambiguation)

A sphincter (TA: musculus sphincter) is a term used in anatomy to refer a ring of muscle which narrows a tube or closes off a bodily orifice 1. anal sphincter external anal sphincter internal anal sphincter hepatic sphincter esophageal sphincter lower esophageal sphincter upper esophagea...

Ram's horn sign

The Ram's horn sign, also known as Shofar sign, is the tubular, conical appearance of the stomach antrum seen on a barium meal. The stomach is less distensible and the curved conical appearance resembles the horn of a ram. This is seen in granulomatous disease, typically Crohn disease, but also...

Aerodigestive tract

The aerodigestive tract is a non-TA descriptive collective term for the respiratory tract and proximal portion of the digestive tract. As it is a non-standard term, its precise components vary somewhat with the context in which the term is being employed. Terminology Definitions of what precis...

Van Assche index

The Van Assche index is a semiquantitative scoring system originally developed in 2003 to assess the severity and disease response in perianal fistulizing Crohn disease. In 2017 substantial changes were proposed to the original system, resulting in the modified Van Assche index. Both system rema...

Abdominal paracentesis contraindications (mnemonic)

A mnemonic to remember the contraindications to abdominal paracentesis is: CAPSID Mnemonic C: coagulopathy (INR >2.0) A: abdominal wall cellulitis P: pregnancy S: surgical abdomen (absolute contraindication) / severe thrombocytopenia (platelet count <50 x 103/μL) I: intra-abdominal adhes...

Pediatric appendicitis score

The Pediatric Appendicitis Score (PAS) is a clinical decision rule and predictor of the likelihood of acute appendicitis in the pediatric population 1. Criteria cough/percussion/hopping tenderness in right lower quadrant (+2) anorexia (+1) fever (+1) nausea or emesis (+1) tenderness in rig...

Acute pancreatitis severity criteria (mnemonic)

A mnemonic to remember the severity criteria for acute pancreatitis is: PANCREAS Mnemonic P: PAO2 <8 kpA A: age >55 years N: neutrophilia (WBC >15 x 109 / L) C: calcium <2 mmol/L R: renal (urea >16 mmol/L) E: enzymes (LDH >600 IU/L and AST >200 IU/L) A: albumin (serum) <32 g/L S: sugar...

Small intestine diverticular disease

Small intestine diverticular disease is an uncommon form of diverticular disease and can be classified into disease affecting the: Meckel diverticulum Meckel diverticulitis non Meckel diverticular disease duodenum - duodenal diverticulosis duodenal diverticulitis jejunum and ileum - jejuno...

Portal venous phase

The portal venous phase, also known as the late portal phase or hepatic phase, is a contrast-enhanced CT or MRI series that has the following characteristics: liver parenchyma is at its peak enhancement with a density >110 HU (an increase of at least 50 HU from the unenhanced baseline)1,2 ...

Rosenbach sign (hemiplegia)

Rosenbach sign or phenomenon is a clinical sign described in hemiplegia. The sign refers to the absence of an abdominal wall skin reflex when stroking the paralyzed side of a patient; conversely on the unaffected side, the reflex is normal 1. See also Rosenbach gave his name to two other cli...

Obturator sign

Obturator sign is a clinical sign of acute appendicitis, it is defined as discomfort felt by the subject/patient on the slow internal movement of the hip joint, while the right knee is flexed. It indicates an inflamed pelvic appendix that is in contact with the obturator internus muscle 1-3. Se...

Late arterial phase

The late arterial phase, also known as the corticomedullary phase or early venous portal phase, is a contrast-enhanced CT or MRI series, in which there is an optimal enhancement of structures that get their blood supply directly from the arterial system. The standard characteristics for this ph...

Steelpan sign (sigmoid volvulus)

The steelpan sign refers to the close resemblance of sigmoid volvulus on CT to the percussion instrument known as the steelpan. The steelpan, also known as steel drum or pan, is a Caribbean musical instrument invented in Trinidad and Tobago by the mid-1930s, which became very popular in Trinidad...

Hypervascular splenic lesions

Hypervascular splenic lesions are findings that enhance more or similarly to the background splenic parenchyma on late arterial phase, on contrast-enhanced CT or MRI. Vascular mycotic aneurysm Neoplastic splenic hemangioma 2 most common primary benign neoplasm of the spleen second most com...

Split-wall sign (sigmoid volvulus)

The split-wall sign is one of the signs of sigmoid volvulus. This sign is characterized by the separation of the walls of a single loop of the sigmoid colon due to the invagination of mesenteric fat between them. The intervening fat causes the loop to appear bilobed or C-shaped on axial images, ...

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