Archive | August 2012

QUIZ: What important sign is seen on this non-contrast CT brain?…

QUIZ: What important sign is seen on this non-contrast CT brain? Diagnosis? Click here for ANSWER

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Celery stalk sign – describes the appearance of an anterior…

Celery stalk sign – describes the appearance of an anterior cruciate ligament that has undergone mucoid degeneration (a common phenomenon). Its low signal longitudinal fibers are separated from each other by higher signal mucinous material simulating the appearance of celery. It is important to differentiate mucoid degeneration from ACL tear where there will be high signal but absent or disrupted low signal fibres.   

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Hypertrophic pyloric stenosis – classically presents as…

Hypertrophic pyloric stenosis – classically presents as non-bilious projectile vomiting during the second month of life. Ultrasound is excellent for first line assessment with the pylorus considered hypertrophied if it exceeds 15mm in length and 3mm or more in thickness (from lumen to outer edge). The stomach will usually be distended with fluid and at no time during the scan will the pylorus open. The cervix sign (left image), antral nipple sign and target sign are commonly described in pyloric stenosis but really they are of little relevance compared to direct muscle measurements. 

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CT images from a patient with ischaemic gut. Yellow arrows show…

CT images from a patient with ischaemic gut. Yellow arrows show air within the dying bowel wall. Green arrows show gas filling peripheral portal veins in the liver. Red arrows point to occluded coeliac and superior mesenteric arteries.

This is just 1 of 20 amazing cases featured in our new ‘CT Acute Abdomen Case Pack’ now available for purchase with our free iPhone / iPad App. Download it from the app store today and help support Radiopaedia.org, a not-for-profit collaborative online radiology resource. 

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Honeycombing – a common and distinctive CT finding in pulmonary…

Honeycombing – a common and distinctive CT finding in pulmonary fibrosis (usual interstitial pneumonia). It refers to clustered cystic air spaces between 0.3 to 1.0 cm in diameter typically in a subpleural basal distribution. The walls of the cysts are usually well-defined and thick. Honeycombing is an irreversible finding in interstitial lung disease and associated with a poor prognosis.

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Lightbulb sign – refers to the abnormal AP radiograph appearance…

Lightbulb sign – refers to the abnormal AP radiograph appearance of the humeral head in posterior shoulder dislocation. When the humerus dislocates it also internally rotates such that the head contour projects like a lightbulb. Because the sign is subtle it is often missed by the untrained observer. Axillary view (bottom right) demonstrates the posterior dislocation much more obviously. 

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Protrusio acetabuli – the cool way of saying acetabular…

Protrusio acetabuli – the cool way of saying acetabular protrusion. Refers to the inward bulging of the acetabulum into the pelvis usually with resultant over-covering of the femoral head. The deformity may be due to trauma but in many cases it is a sign of an underlying disease such as rheumatoid arthritisankylosing spondylitisricketsPaget’s disease and osteogenesis imperfecta. The above patient had Marfan syndrome.

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