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Jack and Jill lesion

Jack and Jill lesion refers to simultaneous bucket handle tears of medial and lateral menisci with intercondylar notch displacement of the fragments which appear as quadruple sign on coronal MRI images.

Jejunoileal fold pattern reversal

Jejunoileal fold pattern reversal (a.k.a. jejunisation of the ileum) is one of the signs of coeliac disease, and is seen on small bowel follow-through studies as well as CT. The pattern is one of increased number of ileal folds and reduced number of jejunal folds 1,2, and is considered positive ...

J shaped sella

A J-shaped sella is a variant configuration of the sella turcica, where the tuberculum sellae is flattened, thus forming the straight edge of the "J". The dorsum sellae remains rounded and forms the loop of the "J". Differential diagnosis Differential diagnosis for a J-shaped sella includes 1,...

J sign (shoulder)

The J sign refers to the appearance of the inferior glenohumeral ligament in the presence of a humeral avulsion of the glenohumeral ligament (HAGL lesion). The normal U-shaped inferior glenohumeral recess is retracted away from the humerus, appearing as a J (right shoulder).

Juxtaphrenic peak sign

The juxtaphrenic peak sign or diaphragmatic tenting refers to the peaked or tented appearance of a hemidiaphragm which can occur in the setting of lobar collapse. It is caused by retraction of the lower end of diaphragm at an inferior accessory fissure (most common 1), major fissure or inferior ...

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