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 continuously improved upon by countless contributing members. Our dedicated editors oversee each edit for accuracy and style. Find out more about articles.
169 results found
Article
Falciform ligament sign
The falciform ligament sign, also called the Silver sign, is characterized by the falciform ligament being outlined with free abdominal gas in cases of pneumoperitoneum of a large amount.
It is almost never seen in isolation as, if there is enough free gas to outline the falciform ligament, th...
Article
Split scar sign (rectal cancer response assessment)
The split scar sign has been described as a feature on rectal cancer MRI studies acquired following chemoradiotherapy and having a high specificity and positive predictive value for a complete response 1. In a meta-analysis that observed an average complete response rate of 38%, the presence of ...
Article
Rigler sign (bowel)
The Rigler sign, also known as the double-wall sign, is a sign of pneumoperitoneum seen on an abdominal radiograph when gas is outlining both sides of the bowel wall, i.e. gas within the bowel's lumen and gas within the peritoneal cavity. It is seen with large amounts of pneumoperitoneum (>1000 ...
Article
Cone-shaped cecum (differential)
A cone-shaped cecum refers to a loss of the normal rounded appearance of the cecum, which instead becomes narrow and cone-shaped with the apex pointing towards the base of the appendix. It is encountered in a number of conditions including:
inflammatory
infective
blastomycosis
amoebiasis
Ye...
Article
Hyperattenuating ring sign (epiploic appendagitis)
The hyperattenuating ring sign is a sign that has been described with epiploic appendagitis and intraperitoneal focal fat infarction. It refers to a hyperattenuating ring of visceral peritoneum. In the setting of epiplogic appendagitis, the ring would surround a thrombosed vascular pedicle with ...
Article
Lipoma
Lipomas are benign tumors composed of mature adipocytes. They are the most common soft tissue tumor, seen in ~2% of the population.
Epidemiology
Patients typically present in adulthood (5th-7th decades).
Associations
In some cases, multiple lipomas are associated with syndromes and other di...
Article
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...
Article
Cervix sign (pyloric stenosis)
The cervix sign of pyloric stenosis describes the indentation of the pylorus into the fluid-filled antrum, seen in pyloric stenosis on ultrasound examination.
See also
antral nipple sign (pyloric stenosis)
target sign (pyloric stenosis)
Article
Antral nipple sign (pyloric stenosis)
The antral nipple sign refers to redundant pyloric mucosa protruding into the gastric antrum and is seen in hypertrophic pyloric stenosis on ultrasound examination.
See also
cervix sign (pyloric stenosis)
target sign (pyloric stenosis)
Article
Ball of wool sign (hydatid cyst)
The ball of wool sign, also referred to as the yarn sign or congealed water lily sign, is an ultrasound appearance, representing degeneration of hydatid cysts (WHO class CE 4). The inner side of the cyst detaches from the cyst wall and folds on itself, causing a change from anechoic (fluid) to a...
Article
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 brain MRI in deep border zone infarction
string of pearls sign on brain MRI in Susac syndrome
string of pearls sign on ultrasound in polycys...
Article
Stierlin sign (tuberculosis of ileocecal junction)
The Stierlin sign refers to repeated emptying of the cecum, seen radiographically as barium remaining in the terminal part of the ileum and in the transverse colon. This occurs due to irritation of the cecum caused by M. tuberculosis. It is not specific for tuberculosis and can also be seen in C...
Article
Tumor deposits
Tumor deposits in the context of colon and rectal cancer are discrete nodules of tumor tissue within the mesocolon or mesorectum respectively, found along the path of draining veins, and are distinct from lymph node metastases 1-3. They are found in >50% of MRI studies of patients with rectal c...
Article
V sign (disambiguation)
Signs inspired by the letter V have been described in several different pathologies:
inverted V sign (pneumoperitoneum)
inverted V sign (spinal cord)
Naclerio V sign (pneumomediastinum)
V sign (interphalangeal joint subluxation)
V sign (midbrain)
Article
Apple core sign (colon)
The apple core sign, also known as the napkin ring sign (bowel), is most frequently associated with constriction of the lumen of the colon by a stenosing annular colorectal carcinoma.
It is not to be confused with the napkin ring sign of vulnerable coronary artery plaque or the apple core sign ...
Article
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...
Article
Whirlpool sign (mesentery)
The whirlpool sign of the mesentery, also known as the whirl sign, is seen when the bowel rotates around its mesentery leading to whirls of the mesenteric vessels.
Terminology
The term whirlpool sign is used in other contexts: see whirlpool sign (disambiguation).
Radiographic features
It is...
Article
Gasless abdomen
A gasless abdomen refers to a paucity of gas on abdominal radiography, and the specific cause can usually be identified when the patient's history is known. Common causes include:
proximal obstruction: gastric outlet obstruction, esophageal atresia
small bowel obstruction
bowel ischemia
asci...
Article
Small bowel feces sign
The small bowel feces sign can be observed on abdominal CT. The sign has been described as a finding specific for small bowel obstruction or another severe small bowel abnormality (e.g. metabolic or infectious disease).
While the reported prevalence of the sign in small bowel obstruction is low...
Article
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 hypoechoic bands. The echogenic bands are formed by the serosa and submucosa either side of the hypoechoic muscularis propria 1....
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