Collar Sign

A term of art referring to a radiolucent band of oedema surrounding a benign peptic ulcer, seen by radiocontrast studies of the upper GI tract
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The most common of these include visualization of diaphragmatic defects, collar sign, dependent viscera sign, diaphragmatic thickening and peridiaphragmatic contrast extravasation.
Haemoperitoneum, pneumoperitoneum and a waist-like collar sign indicative of herniated viscera or fat should raise suspicion.
Abdominal contents in the thorax, with or without signs of focal constriction ("collar sign")
Metz recommended getting MRI exams of all congenital dermoid cysts on the scalp, especially if there's an overlying hair collar sign (longer, coarser, darker hair surround the scalp nodule) or capillary stain, or if the cyst is in an atypical location.
(2) The hump sign is a variant of the collar sign; it occurs as a result of a portion of liver herniating (Fig.
Metz recommended getting MRI exams of all congenital dermoid cysts on the scalp, especially if there's an overlying hair collar sign (longer, courser, darker hair surround the scalp nodule) or capillary stain, or if the cyst is in an atypical location.
Some cases of aplasia curls congenita will have a so-called hair collar sign, which is a ring of dark hair that often surrounds a scalp lesion.
Some cases of aplasia cutis congenita will have a so-called hair collar sign, which is a ring of dark hair that often surrounds a scalp lesion.