Accordion Sign-appearance
of oral contrast trapped between colonic folds thickened by submucosal edema,
esp in C. difficile colitis
Abdominal Cocoon-AKA
sclerosing encapsulating peritonitis; encasement of variable lengths of bowel by
a dense fibrocollagenous membrane giving the appearance of a cocoon
Air Crescent Sign-sickle-shaped
lucency partly surrounding a mass in a pulmonary cavity on chest x-ray &
CT; classically, aspergillomas
Air Bronchogram
Sign-black-branching air-filled bronchi visible because of surrounding airspace
disease, such as in pneumonia
Angel Wing
Appearance-AKA Bat Wing-pattern of pulmonary edema which involves perihilar
regions and spares cortex of lung
Anteater's Nose
Sign-on lateral view of foot, elongated anterior, superior process of
calcaneous seen in tarsal coalition
Aortic Nipple-bump
caused by left superior intercostal vein as it wraps around outer edge of aorta
Apple Core-appearance
of an annular constricting carcinoma of the bowel, usually the colon, from circumferential
involvement of lumen
Acorn cyst-breast-breast-US-type
of complex cyst where the echogenicity within the cyst is due to fat and
protein cells; also known as Fatty Cyst
Absent Bow-Tie
Sign-absence of normal bow-tie appearance of meniscus on sagittal MRI of
knee in bucket handle tears
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