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
References in periodicals archive ?
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.
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.
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.
The hair collar sign "suggests cranial dysraphism, especially with overlying vascular malformation.