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.

9 results found
Article

Kernohan phenomenon

Kernohan notch phenomenon is an imaging finding resulting from extensive midline shift due to mass effect, resulting in indentation in the contralateral cerebral crus by the tentorium cerebelli. This has also been referred to as Kernohan-Woltman notch phenomenon and false localising sign. Clini...
Article

Kerr kink

Kerr Kink a sign of renal tuberculosis. Scarring leads to a sharp kink at the pelvi-ureteric junction.
Article

Keyhole sign

The keyhole sign is an ultrasonographic sign seen in boys with posterior urethral valves. It refers to the appearance of posterior urethra which is dilated, and associated thick walled distended bladder which on ultrasound may resemble a key hole.
Article

Kidney sweat sign

The kidney sweat sign applies to the presence of thin, hypoechoic, extracapsular fluid collections around kidneys in renal failure patients. This fluid is assumed to represent perirenal oedema. It can be appreciated on ultrasound, CT and MR imaging.  Differential diagnosis perirenal haematoma ...
Article

Kirklin complex

The Kirklin complex is a combination of the Carman meniscus sign associated with a radiolucent semi-circular zone surrounding the elevated ridge of the ulcer. This complex is seen in cases of gastric adenocarcinoma on barium studies. See also Carman meniscus sign
Article

Kirklin sign

The Kirklin sign refers to a deformity of the normal gastric air bubble on an upright chest radiograph due to a mass lesion of the gastric cardia or fundus. The differential for a Kirklin sign includes gastric tumour gastric carcinoma oesophageal carcinoma gastrointestinal stromal tumour (G...
Article

Kirner deformity

Kirner deformity is characterised by a curvature of the distal phalynx of the 5th digit in both a palmar and radial direction. Epidemiology The deformity typically presents in late childhood to early adolescence, although a mild deformity may be present at birth. Both sexes are affected, altho...
Article

Kissing carotids

The term kissing carotids refers to tortuous and elongated vessels which touch in the midline. They can be be found in:  retropharynx 2 intra-sphenoid 1 within the pituitary fossa within sphenoid sinuses within sphenoid bones The significance of kissing carotids is two-fold: may mimic int...
Article

Knuckle sign

Knuckle sign refers to the abrupt tapering or cutoff of a pulmonary artery secondary to embolus. It is better visualised on CT pulmonary angiography scan than chest x-ray. This is an important ancillary finding in pulmonary embolism (PE), and often associated with the Fleischner sign of dilated ...

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