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.

929 results found
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Splenic trauma

Splenic trauma can occur after blunt or penetrating trauma or secondary to medical intervention (i.e. iatrogenic). The spleen is the most frequently injured organ after blunt trauma. Clinical presentation Patients may present with left upper quadrant/left chest pain, left shoulder tip pain (re...
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Splenic vein

The splenic vein drains the spleen, part of the pancreas, and part of the stomach.  Gross anatomy Origin and course The splenic vein is formed by splenic tributaries emerging at the splenic hilum in the splenorenal ligament at the tip of the tail of pancreas. It runs in the splenorenal ligame...
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Splenomegaly

Splenomegaly is a term which refers to enlargement of the spleen. The normal adult splenic length upper limit is usually around 12-15 cm. Pathology The causes of splenomegaly are protean, and can be thought of under a number of headings: haematological disease haemodynamic infectious stora...
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Splenorenal ligament

Splenorenal ligament is a peritoneal ligament. It represents the dorsal most part of dorsal mesentery.  It contains pancratic tail. In settings of portal hypertension, collateral circulation may establish within the splenorenal ligament.  
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Splenosis

Splenosis is one type of ectopic splenic tissue (the other being accessory spleen). It is an acquired condition and is defined as autoimplantation one or more focal deposits of splenic tissue in various compartments of the body. Abdominal splenosis is seen after abdominal trauma or surgery (e.g...
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Sprue

Sprue is the collective term for the malabsorptive gastrointestinal enteropathies although it may be used to refer directly to tropical sprue. It is composed of two entities: tropical sprue non-tropical sprue / coeliac disease In each, the radiologic features are not sensitive enough to confi...
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Stepladder sign (disambiguation)

Stepladder sign may refer to: intra-capsular breast implant rupture (ultrasound) air-fluid levels in obstructed small bowel (erect abdominal radiograph)
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Stepladder sign (small bowel obstruction)

Stepladder sign represents the appearance of air-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.  On breast imaging, the stepladder sign is used to describe intracapsul...
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Stercoral perforation

Stercoral perforation is defined as a bowel perforation due to pressure necrosis from a faecal mass (faecaloma) 1. It is uncommon, but a life-threatening, complication of unresolved faecal impaction and can be a cause of acute abdomen secondary to faecal peritonitis. Epidemiology It may repres...
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Stierlin sign (tuberculosis of ileocaecal junction)

The Stierlin sign refers to repeated emptying of the caecum, seen radiographically as barium remaining in the terminal part of the ileum and in the transverse colon. This occurs due to irritation of the caecum caused by M. tuberculosis.   See also gastrointestinal tuberculosis  Fleischner si...
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Stomach

The stomach lies between the oesophagus and duodenum in the upper abdomen. It lies on the left side of the abdominal cavity caudal to the diaphragm. Gross anatomy The stomach (normal volume 45 mL) is divided into distinct regions: cardia: the area that receives the oesophagus (gastro-oesophog...
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Stomal ulcer

Stomal ulcers may occur after surgery for peptic ulcer disease, and are more common in settings of a retained gastric antrum or an incomplete vagotomy (occurrences which are not common with modern surgical technique). There is also a higher risk with Zollinger-Ellison syndrome. Radiographic fea...
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Streak ovaries

Streak ovaries are a form of ovarian dysgenesis and are associated with Turner syndrome. Occasionally they may be functional and secondary sexual characteristics may develop.  Pathology Streak ovaries are seen when there is abnormality or absence of the X chromosome.  Associations Turner syn...
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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 (bowel)

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

Stump appendicitis refers to inflammation of the residual appendiceal tissue post appendectomy. Partial removal of appendix with a residual stump, allows for a chance of recurrent appendicitis. Chances of a partial removal is found to be higher in cases where there is a wrong identification of ...
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Subcapsular splenic haematoma

Subcapsular splenic haematomas are a type of splenic haematoma that occurs beneath the splenic capsule. Pathology They can occur in both traumatic and non-traumatic situations. Associations abdominal: splenic trauma 3, a subcapsular haematoma is part of imaging criteria for grades I-III of t...
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Subdiaphragmatic free gas

Subdiaphragmatic free gas is one of the ways of detecting presence of free intraperitoneal air (i.e. pneumoperitoneum). It is the presence of free, extraluminal air in the anterior subhepatic space.  Radiographic features Plain radiograph Subdiaphragmatic free gas is well appreciated as the a...
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Sudeck point

The Sudeck point (or Sudeck critical point) refers to a specific location in the arterial supply of the rectosigmoid junction, namely the origin of the last sigmoid arterial branch from the inferior mesenteric artery (IMA) 1.  This arterial branch usually forms an anstomosis with a branch of th...
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Superior mesenteric artery

The superior mesenteric artery (SMA) is one of the three non-paired arteries that provide blood to the midgut and other abdominal viscera. Gross anatomy Origin Single vessel arising anteriorly from the abdominal aorta at the level of L1. Course Courses anteroinferiorly, behind the neck of p...
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Superior mesenteric artery compression disorders

There are two distinct vascular compression disorders due to compression of another structure by the superior mesenteric artery. The terminology is sometimes confusing and they can occur in association.   superior mesenteric artery syndrome (Wilkie syndrome): compression of the third part of th...
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Superior mesenteric artery syndrome

Superior mesenteric artery (SMA) syndrome, also known as Wilkie syndrome, is a rare acquired vascular compression disorder in which acute angulation of superior mesenteric artery (SMA) results in compression of the third part of the duodenum leading to obstruction. It should not be confused wit...
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Superior mesenteric vein

The superior mesenteric vein (SMV) accompanies the superior mesenteric artery (SMA) and drains the midgut to the portal venous system. Gross anatomy Origin and course Mesenteric venous arcades, which accompany the arteries, unite to form the jejunal and ileal veins in the small bowel mesenter...
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Superior rectal artery

Summary origin: the terminal branch of the inferior mesenteric artery is the superior rectal artery course: descends into the pelvic cavity in the sigmoid mesocolon, crossing the left common iliac vessels branches: opposite the S3 vertebra the superior rectal artery divides into two terminal ...
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Supramesocolic space

The supramesocolic space is the intraperitoneal space above the root of the transverse mesocolon. The inframesocolic space lies below the root of the transverse mesocolon. It can be arbitrarily divided into right and left spaces and subspaces. These are normally in communication with each other...
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Supravesical fossa

The supravesical fossae are concave depressions of peritoneum in the paravesical space bounded by the median umbilical fold and the medial umbilical folds. It partially overlies the inguinal (Hesselbach’s) triangle. The supravesical fossae are usually occupied by small bowel loops and the urinar...
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Surgical haemostatic material

Surgical haemostatic material is used to control bleeding intraoperatively and is hence frequently voluntarily left in the operative bed, not to be confused with a gossypiboma which is foreign material left by mistake. It can mimic an abscess on imaging studies. Various types are available, the ...
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Syphilis

Syphilis is the result of infection with the gram negative spirochete Treponema pallidum, subspecies pallidum. It results in a heterogeneous spectrum of disease with many systems that can potentially be involved, which are discussed separately.  Epidemiology Despite the discovery of penicillin...
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Systemic lupus erythematosus

Systemic lupus erythematosus (SLE) is a complex autoimmune disease with multisystem involvement. It is also sometimes classified as a vasculitis.  Epidemiology There is an overall increased female predilection. In adults, women are affected 9-13 times more than males. In children, this ratio i...
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Taeniae coli

The taeniae coli are the three outer muscular bands of the colon. They sit on top of the inner circumferential layer and result in the classical appearance of the colon: the haustral markings are interrupted unlike the valvulae conniventes within the small bowel.
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Tailgut duplication cyst

Tailgut duplication cysts, also known as retrorectal cystic hamartomas, are rare congenital lesions that are thought to arise from vestiges of the embryonic hindgut.  Epidemiology There is a recognised strong female predilection. While it can present at any age presentation is usually at aroun...
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Tanaka criteria

The Tanaka criteria (or Fukuoka consensus guidelines) is a classification system for intraductal papillary mucinous neoplasms (IPMNs) and mucinous cystic neoplasms (MCNs). The original international consensus guidelines (2006) were referred to as the  Sendai criteria. This later evolved into th...
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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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Tc-99m pertechnetate

Tc-99m pertechnetate is one of the technetium radiopharmaceuticals used in imaging of thyroid, colon, bladder and stomach. Characteristics photon energy: 140 keV physical half-life biological half-life: 6 hours normal distribution: stomach, thyroid, salivary glands, (testicles) excretion: ...
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Tc-99m sulfur colloid

Technetium-99m sulfur colloid is one of the technetium radiopharmaceuticals. Characteristics photon energy: 140 keV physical half-life: 6 hours biological half-life normal distribution: liver: 85% spleen: 10% bone marrow: 5% excretion: hepatic target organ: liver, spleen pharmacokinet...
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Tear drop sign of the superior mesenteric vein

Tear drop sign of the superior mesenteric vein (SMV) is one of the important signs in the staging of pancreatic adenocarcinoma. Its importance lies in its diagnosis as well as prognostic significance. This sign is used in assessing the resectability of pancreatic cancer. Radiographic appearance...
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Tension gastrothorax

Tension gastrothorax describes a rare life-threatening condition caused by mediastinal shift due to a distended stomach herniating into the thorax through a diaphragmatic defect.  Clinical presentation Presentation is generally with acute and severe respiratory failure, with clinical features ...
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Tension pneumoperitoneum

Tension pneumoperitoneum is a special and rare type of pneumoperitoneum, in which the free intra-abdominal peritoneal gas is under pressure. The mechanism is thought to be a ball-valve effect allowing the one-way accumulation of gas. This results in: elevation and splinting of the diaphragm red...
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Terminal ileitis (differential)

The differential diagnosis for a terminal ileitis is quite extensive, and includes: inflammatory bowel disease Crohn's disease (most common) backwash ileitis due to ulcerative colitis infectious colitis Yersinia spp.  Yersinia enterocolitica Yersinia pseduotuberculosis Salmonella spp. C...
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Terminal ileum

The terminal ileum is the most distal segment of small bowel. It immediately precedes the small bowel's connection with the colon through the ileocaecal valve. It is of particular interest since a number of infectious and inflammatory processes preferentially involve the segment. location: the ...
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Thumbprinting

Thumbprinting is a radiographic sign of large bowel wall thickening, usually caused by oedema, 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 Aetiology ...
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Tissue tropism

Tissue tropism is a phenomenon by which certain host tissues preferentially support the growth and proliferation of pathogens. This concept is central to the radiological evaluation of infectious disease.  Pathology As infections that display tissue tropism will thrive in certain tissue locati...
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Toxic megacolon

Toxic megacolon (TM) is complication that can be seen in both types of inflammatory bowel disease, and less commonly in infectious colitis, as well as in some other types of colitis. Pathology The mechanisms involved in development of toxic megacolon are not entirely clear, although chemical m...
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Toxoplasmosis

Toxoplasmosis is a common worldwide parasitic disease caused by the protozoan Toxoplasma gondii. It is usually an asymptomatic infection, but it is related with several sequelae when acquired in-utero or related with cerebral abscesses due to its reactivation in immunocompromised patients (e.g. ...
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Tracheo-oesophageal fistulation

Tracheo-oesophageal fistula is a pathological communication between the trachea and oesophagus. It can be broadly classified into two types: congenital tracheo-oesophageal fistula acquired tracheo-oesophageal fistula: from malignancy/tuberculosis
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Transient intussusception

Transient (non-obstructing) intussusception without a lead point is known to occur in both adults and children and occurs more frequently than was previously reported. Transient intussusception of the small bowel has been reported in adults with coeliac disease and Crohn disease but is most fre...
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Transpyloric plane

The transpyloric plane, also known as Addison's plane, is an imaginary axial plane located midway between the jugular notch and superior border of pubic symphysis, at approximately the level of L1 vertebral body. It an important landmark as many key structures are visualised at this level, altho...
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Transverse colon

The transverse colon is the longest and most mobile part of the large intestine. It measures up to 45 cm in length.  Gross anatomy The transverse colon is the continuation of the ascending colon from the right colic flexure. It passes from the right to left hypochondrium in a downward convex p...
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Transverse mesocolon

The transverse mesocolon is a broad, meso-fold of peritoneum, which connects the transverse colon to the posterior wall of the abdomen. It is continuous with the two posterior layers of the greater omentum, which, after separating to surround the transverse colon, join behind it, and are contin...
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Traumatic abdominal wall hernia

Traumatic abdominal wall hernia (TAWH) represents traumatic disruption of musculature and fascia of anterior abdominal wall without skin penetration. Pathology Traumatic abdominal wall hernia (TAWH) is caused by blunt trauma to the abdomen. In adults, it usually results from road traffic acci...
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Troisier sign

Troisier sign is the clinical finding of a hard and enlarged left supraclavicular node (Virchow node), and is considered a sign of metastatic abdominal malignancy. Terminology It is sometimes referred to as Virchow node, which is the name given by Dr Rudolf Virchow (1821-1902), a German pathol...
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Tropical pancreatitis

Tropical pancreatitis is a subtype of chronic pancreatitis associated with malnutrition, tropical countries, and a young age of onset. There are characteristic, large ductal calculi, which may measure up to a few centimeters in size. This is in contrast to the small, speckled calculi more common...
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Tuberculous peritonitis

Tuberculous peritonitis is a result of peritoneal involvement in tuberculosis. It is frequently seen in association with other forms of gastrointestinal tuberculosis 6. Epidemiology Tuberculosis is usually confined to the respiratory system but may involve any organ system, particularly in imm...
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Tumour-to-tumour metastasis

A tumour-to-tumour metastasis, also known as a collision tumour, is a rare metastatic process in which a primary malignant tumour ('donor') metastasises to another tumour ('recipient'), most commonly a benign tumour such as a meningioma. Epidemiology Tumour-to-tumour metastasis is considered v...
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Tumours of the small intestine

The small intestine is rarely the site of malignant tumours, although it accounts for ~75% of the entire length of the GI tract and more than 90% of the mucosal surface. Approximately 40 different histologic tumour types have been described.  In this article, an overview will be given of the mo...
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Turcot syndrome

Turcot syndrome is one of the variations in polyposis syndromes. Epidemiology Patients typically present in the second decade 3. Pathology Turcot syndrome  is characterised by: intestinal polyposis CNS tumours: most commonly glioblastoma or medulloblastoma Genetics It is thought to carry...
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Typhlitis

Typhlitis, also called caecitis or neutropaenic colitis, is a necrotising inflammatory condition which typically involves the caecum and, sometimes, can extend into the ascending colon or terminal ileum. Epidemiology Typhlitis was first described in children with leukaemia and severe neutropae...
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Ulcerative colitis

Ulcerative colitis is an inflammatory bowel disease that not only predominantly affects the colon, but also has extraintestinal manifestations. Epidemiology Typically ulcerative colitis manifests in young adults (15-40 years of age) and is more prevalent in males but the onset of disease after...
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Ultrasound guided biopsy

Ultrasound guided biopsy is one form of image guided biopsy, typically performed by a radiologist.  It is the most common form of image guided biopsy, offering convenience and real time dynamic observation with echogenic markers on cannulae allowing for precise placement. It can potentially be ...
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Ultrasound guided percutaneous drainage

Ultrasound guided percutaneous drainage is one form of image guided procedure, allowing minimally invasive treatment of collections that are accessible by ultrasound study. It has several advantages and disadvantages over CT, which include: Advantages is a dynamic study, allowing greater prec...
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Umbilical hernia

Umbilical hernias are the most common ventral hernia and occur in the midline. Epidemiology Ten times more common in females 2 and represent ~5% of all abdominal hernias 4. Clinical presentation Umbilical hernias present in the midline as painless or painful mass.  Pathology Umbilical hern...
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Upper gastrointestinal bleeding

Upper gastrointestinal bleeding (UGIB) is defined as bleeding proximal to the ligament of Treitz. Epidemiology The incidence of acute UGIB is ~100 per 100,000 adults per year. UGIB is twice as common in men as in women and increases in prevalence with age 5. The demographics of the affected in...
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US abdomen (summary)

Ultrasound abdomen is one of the tests that is commonly used in the assessment of patients with abdominal pain. It is particularly useful for the assessment of solid organs and fluid-filled structures. Reference article This is a summary article; we do not have a more in-depth reference articl...
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Valvulae conniventes

The valvulae conniventes, also known as Kerckring folds, plicae circulares or just small bowel folds, are the mucosal folds of the small intestine, starting from the second part of the duodenum, they are large and thick at the jejunum and considerably decrease in size distally in the ileum to di...
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Vascular Ehlers Danlos syndrome

Vascular Ehlers-Danlos syndrome (EDS) or type IV Ehlers-Danlos syndrome (EDS 4) is the most malignant form of Ehlers-Danlos syndrome. This form is often accompanied by neurovascular complications secondary to vessel dissections and/or aneurysms. Epidemiology Vascular EDS represents about 4% of...
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Vertical-banded gastroplasty

Vertical-banded gastroplasty (VBG) is an older, purely restrictive procedure used to treat morbid obesity. Procedure It involves creating a small gastric pouch, based on the lesser curvature of the stomach (which is thicker and less resistant to stretching than the greater curvature), by using...
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Vicarious contrast material excretion

Vicarious contrast material excretion (VCME) defines excretion of water-soluble contrast material in a way other than via normal renal secretion.  The most common vicarious excretion of water-soluble contrast material is via the liver, resulting in increased bile density seen in the gallbladder...
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VIPoma

VIPomas are a very rare pancreatic endocrine tumour that classically presents with watery diarrhoea and hypokalaemia. These tumours secrete, and get their name from, vasoactive intestinal peptide (VIP).  Epidemiology VIPomas represent <2% of pancreatic endocrine tumours 2.  Clinical presentat...
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Vitamin B3

Vitamin B3 (niacin or nicotinic acid) is a water soluble vitamin that is an important part of the coenzyme nicotinamide adenine dinucleotide (NAD+) which is involved in many reactions of cellular metabolism. Related pathology Pathological manifestation occur in niacin deficiency known as pella...
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Von Hippel-Lindau disease

Von Hippel-Lindau (vHL) disease is characterised by the development of numerous benign and malignant tumours in different organs (at least 40 types 1) due to mutations in the VHL tumour suppressor gene on chromosome 3. Epidemiology The disease is rare with an estimated prevalence of 1:35,000-5...
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Walled-off pancreatic necrosis

Walled-off pancreatic necrosis (WOPN) is a late complication of acute pancreatitis, although it can occur in chronic pancreatitis or as a result of pancreatic trauma. Differentiation of WOPN from pancreatic pseudocyst is essential because management differs. WOPN may need aggressive treatment to...
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Wandering spleen

Wandering spleen is a rare condition in which the spleen migrates from its usual anatomical position, commonly to the lower abdomen or pelvis. Epidemiology Wandering spleen is rare, with a reported incidence of <0.5%. Diagnosis is most commonly made between ages 20 and 40 and is more common i...
Article

Water-siphon test

The water siphon test may be performed as part of a barium swallow to assess for gastro-oesophageal reflux in a hiatal hernia. It is performed in the supine RPO position with the patient drinking water continuously. The test is said to be positive if there is visible barium reflux in the oesopha...
Article

Whipple disease

Whipple disease is a rare infectious multisystem disorder caused by the actinobacteria Tropheryma whipplei. Epidemiology The incidence of Whipple disease is not truly known, one Swiss study estimated it at approximately 1 per 1.5 million per year 7. The peak age for presentation is in the fif...
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Whipple disease (gastrointestinal manifestations)

Gastrointestinal manifestations are a key component of Whipple disease.  The gastrointestinal manifestations of t. whipplei are also known as intestinal lipodystrophy. Pathology Extensive infiltration of lamina propria with large macrophages infected by intracellular Tropheryma whipplei causes...
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Whipple procedure

The Whipple procedure (or partial pancreaticoduodenectomy) is considered the definitive surgical operation to resect carcinoma in the head of the pancreas, periampullary carcinoma, or duodenal carcinoma 1. In the procedure, the head of the pancreas and adjacent duodenum is resected. The gallbla...
Article

Whipple triad

Whipple triad is the clinical presentation of pancreatic insulinomas and consists of: fasting hypoglycemia (<50 mg/dl) symptoms of hypoglycemia immediate relief of symptoms after the administration of IV glucose History and etymology As a good piece of trivia, one would suspect that Whipple...
Article

Whirlpool sign

The whirlpool sign, also known as the whirl sign, is seen when a structure twists upon itself. It is most commonly described in the abdomen where bowel rotates around its mesentery, with mesenteric vessels creating the whirls. It can also be seen in ovarian torsion. Whirlpool sign: mesenteric ...
Article

WHO classification of anal canal tumours

The World Health Organisation classifies anal canal neoplasms into intraepithelial neoplasms and invasive neoplasms which are further divided to epithelial and non-epithelial tumours and secondary lesions: Epithelial tumours squamous cell carcinoma of anal canal adenocarcinoma of anal canal ...
Article

WHO classification of anal margin tumours

The WHO classification of anal margin tumours or perianal skin tumours is: intraepithelial tumours Bowen disease (precursor of squamous cell carcinoma) Paget's disease (precursor of adenocarcinoma) invasive tumours squamous cell carcinoma adenocarcinoma basal cell carcinoma  verrucous ca...
Article

Widening of the presacral space (differential)

Widening of the presacral space is one of the diagnostic indicators of the diseases involving pelvic pathology and rectal involvement. It is ideally measured on barium studies at the level of S3/4 disc level on lateral radiographs and the normal value of the presacral space is <15 mm in adults.​...
Article

Windsock sign (duodenal web)

The windsock sign is a typical appearance of a duodenal web (intraluminal duodenal diverticulum) on upper gastrointestinal contrast series which consists of an intraduodenal barium-contrast filled sac that is surrounded by a narrow lucent line (web or intraluminal mucosal diaphragm) which is wel...
Article

Wound dehiscence

Wound dehiscence is a surgical complication whereby there is rupture of a wound along the surgical scar (dehiscence, refers to "splitting open"). This may occur on the skin surface, or along a deeper suture line. Clinical presentation Presentation may be with pain (e.g. sternal dehiscence), or...
Article

X-marks-the-spot sign (large bowel volvulus)

The X-marks-the-spot is a sign of complete bowel volvulus and refers to the crossing loops of the bowel at the site of the transition. It has been reported to improve diagnostic confidence in detecting caecal and sigmoid volvulus. This is in contrast to the split-wall sign which indicates partia...
Article

Zebra spleen

Zebra spleen, also referred to as psychedelic spleen or more correctly inhomogeneous splenic enhancement refers to the transient heterogeneous parenchymal enhancement of the spleen during the arterial or early portal venous phases of contrast enhancement in CT, MRI, or ultrasound imaging. It is...
Article

Zenker diverticulum

Zenker diverticulum, also known as a pharyngeal pouch, is an outpouching at the level of the hypopharynx, just proximal to the upper oesophageal sphincter. It is located in the posterior midline at the cleavage plane between the thyropharyngeus muscle and the cricopharyngeus muscle (known as the...
Article

Zollinger-Ellison syndrome

Zollinger-Ellison syndrome (ZES) is a clinical syndrome that occurs secondary to a gastrinoma.  Clinical presentation Diagnosis of ZES is often delayed by 5-7 years after the onset of symptoms 2.  Pathology Gastrinomas are usually multiple and typically located in the duodenum (more common) ...
Article

Zuelzer-Wilson syndrome

The Zuelzer-Wilson syndrome (total colonic aganglionosis) is a subset of Hirschsprung disease, in which the whole colon is aganglionic. It is uncommon and accounts for 2-13% of cases of Hirschsprung disease 3. Multiple procedures have been devised to treat the condition, including proctocolectom...

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