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.
74 results found
Article
Lying down adrenal sign
The lying down adrenal sign is a cross-sectional imaging sign of renal agenesis or ectopia in which the ipsilateral adrenal gland appears to be 'lying down' on the psoas muscle posteriorly. Due to the linear as opposed to Y-shaped configuration of the gland in such situations, it is also describ...
Article
Steinstrasse
Steinstrasse [stīn′shtra-se] is the German word for "stone street", describing a possible complication of extracorporeal shock wave lithotripsy (ESWL) for urinary tract calculi, wherein a column of stone fragments forms that blocks the ureter.
Terminology
The term steinstrasse can equally, alb...
Article
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...
Article
White pyramid sign (kidney)
The white pyramid sign, also known as dense renal medulla sign (DRM) or hyperdense renal pyramids sign, refers to the CT appearance of the medullary pyramids of the kidney which can be seen normally on unenhanced CT scans as high-attenuation triangular structures.
Pathology
Etiology
incidenta...
Article
Manta ray sign (bladder)
The manta ray sign is a radiographic appearance in bladder exstrophy. It describes wide midline separation of the pubic bones simulating the appearance of a manta ray swimming towards you 1. The sacrum and iliac wings recall the manta ray’s head and body, with the widely spaced pubic rami formin...
Article
Pine cone bladder
A pine cone bladder or Christmas tree bladder is a cystographic appearance in which the bladder is elongated and pointed with a thickened, trabeculated wall. It is typically seen in severe neurogenic bladder with increased sphincter tone (detrusor sphincter dyssynergia) due to suprasacral lesion...
Article
Cobra head sign (ureter)
The cobra head sign, also known as the spring onion sign, refers to dilatation of the distal ureter, surrounded by a thin lucent line seen in patients with an adult-type ureterocele. The cobra head appearance indicates an uncomplicated ureterocele.
During an excretory phase of an intravenous ur...
Article
Curlicue ureter sign (sciatic hernia)
The curlicue ureter sign 1 was described on intravenous pyelogram studies in cases of ureteral herniation into a sciatic hernia, causing a curled appearance of the herniated ureter. Although very rare, this sign is pathognomonic of ureterosciatic hernias. It can also be seen on CT urogram studies.
Article
Throckmorton sign (pelvis)
Throckmorton sign, also known as John Thomas sign, refers to when the penis points in the direction of unilateral disease, typically of the pelvis or hip.
Throckmorton sign is a slang term used humorously by medical students and residents.
According to the first serious study of the sign publ...
Article
Molar tooth sign (abdomen)
The abdominal molar tooth sign refers to the appearance of contrast media which has spilled out of the urinary bladder on CT cystography after extraperitoneal bladder rupture.
Contrast flows out of the ruptured bladder, occupying the preperitoneal cavum Retzii and surrounds the bladder in the s...
Article
Intramural fat of the urinary bladder
Intramural fat of the urinary bladder is an occasional benign finding on CT/MRI.
Epidemiology
The incidence of this finding in histopathological studies is up to 4%. There is a male predominance 4.
Clinical presentation
It is typically an incidental, asymptomatic finding.
Pathology
Adipoc...
Article
Striated nephrogram
Striated nephrogram is a descriptive term indicating the appearance of alternating linear bands of high and low attenuation in a radial pattern extending through the corticomedullary layers of the kidney on iodine-based intravenous contrast-enhanced imaging.
It is important to know that a simil...
Article
Signet ring sign (renal papillary necrosis)
The signet ring sign has been described as one of the possible appearances of the papillary excavation seen in renal papillary necrosis on intravenous urography or retrograde urography 1. The contrast fills a circumferential necrotic cavity around the tip of the necrotic papilla.
See also
sign...
Article
Signet ring (disambiguation)
The term signet ring refers to the characteristic shape of the jewelry item and in radiology and medicine may refer to the following:
signet ring sign (bronchiectasis)
signet ring sign (scaphoid)
signet ring sign (renal papillary necrosis)
signet ring cells in adenocarcinoma histology such a...
Article
Maiden waist deformity
A maiden waist deformity or sign is a name given to the appearance when there is medial deviation of both ureters. This typically occurs in retroperitoneal fibrosis or unilaterally in cases where there is a retrocaval ureter. In the former, there is medial indrawing of the ureters due to deposit...
Article
Perinephric stranding
Perinephric stranding refers to the appearance of edema within the fat of the perirenal space on CT or MRI. While a degree of symmetric bilateral perinephric stranding is common, particularly in the elderly, asymmetric or unilateral perinephric stranding is an important sign of renal inflammatio...
Article
Female prostate sign
Female prostate sign is a characteristic imaging sign seen in patients with a large urethral diverticulum.
A large urethral diverticulum in females surrounds the urethra, and elevates the base of the bladder, mimicking the typical appearance of enlarged prostate in males.
Article
Claw sign (mass)
The claw sign is useful in determining that a mass arises from a solid structure rather than is located adjacent to it and distorts the outline.
It refers to the sharp angles on either side of the mass, which the surrounding normal parenchyma forms when the mass has arisen from the parenchyma. ...
Article
Keyhole sign (posterior urethral valves)
The keyhole sign is an ultrasonographic sign seen in boys with posterior urethral valves. It refers to the appearance of the proximal urethra (which is dilated) and an associated thick walled distended bladder which on ultrasound may resemble a keyhole.
Article
Delayed nephrogram
A delayed nephrogram, commonly described on plain film urography, but also visible on CT urography, is when there is absence or reduction of the normal renal parenchymal enhancement on the nephrographic phase images.
Terminology
A delayed nephrogram is characteristically unilateral and is usua...
Unable to process the form. Check for errors and try again.