Archive | August 2012

QUIZ: Have a good “fist” at finding the abnormality…

QUIZ: Have a good “fist” at finding the abnormality on this radiograph then click here for the ANSWER!

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Lipohaemarthrosis – literally means fat and blood within a…

Lipohaemarthrosis – literally means fat and blood within a joint. Its presence implies an intra-articular fracture with marrow fat having leaked out into the joint. Because fat is less dense than blood it separates on top creating a perfectly straight line known as the FBI sign (Fat-Blood Interface). The sign is best seen on lateral horizontal beam images of the knee within the suprapatellar pouch. The above patient has a tibial plateau fracture

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Bamboo spine – seen in ankylosing spondylitis as a result of…

Bamboo spine – seen in ankylosing spondylitis as a result of vertebral body fusion by syndesmophytes and often fusion of the posterior elements as well. It predisposes to unstable spinal fractures and inflammatory intervertebral disc lesions known as Anderson lesions. Another plain radiograph sign of ankylosing spondylitis is the dagger sign where the spinous processes are fused.  

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Dural tail sign – thickening of the dura directly adjacent…

Dural tail sign – thickening of the dura directly adjacent to, and seemingly contiguous with, an intracranial mass. Although it may be seen in association with several different pathologies, it is classically described in meningioma being present in around 70% of cases. The tail of thickening was initially thought to result from direct tumour invasion, however it is now thought to be largely reactive in nature.

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Throckmorton sign – when the penis points in the direction of…

Throckmorton sign – when the penis points in the direction of unilateral disease on a pelvic radiograph. Also known as the John Thomas sign, when present it is very important for radiologists to report it so as to improve overall morale amongst medical staff. A variant of this sign is the Mark Morton sign when the penis is unusually small (poor Mark). Neck of femur fracture is one on the most common pathologies indicated by the Throckmorton sign, however many rarer entities have been found including the above example of a femoral enchondroma in a patient with Muffucci syndrome.

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QUIZ: PEG view of a 20yo male involved in a motorcycle accident….

QUIZ: PEG view of a 20yo male involved in a motorcycle accident. Is the alignment normal or abnormal? Click for ANSWER  

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Soft-tissue rim sign – helpful in distinguishing a ureteric…

Soft-tissue rim sign – helpful in distinguishing a ureteric stone from a phlebolith on CT imaging. Ureteric stones appear as a calcific density with a surrounding rim of soft tissue representing the oedematous ureteric wall (red arrow). Phleboliths on the other hand usually have imperceptible walls and therefore they appear to be surrounded by fat (green arrow). Occasionally phleboliths have a tail of remnant parent vein associated with one edge known as the comet-tail sign

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