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Palla sign

Seen on chest Xr suggestive of pulmonary embolism, usually seen in the acute setting. The descending interlobar branch of the right pulmonary artery is enlarged, causing a "sausage" appearance towards right middle lobe of the chest radiograph.

Matterhorn sign

The Matterhorn sign is a descriptive sign for a calcified disc herniation that impales the dural sac and sometimes the cord, typically located in the thoracic spine.

Westermark sign

Westermark sign is a sign of pulmonary embolus seen on chest radiographs. ocal peripheral hyperlucency secondary to oligemia resulting in a collapsed appearance of vessels distal to the occlusion

Mistletoe sign

Refers to solid enhancing perivascular masses around the coronary arteries in the presence of idiopathic retroperitoneal fibrosis (Ormond's disease). might be a characteristic of retroperitoneal fibrosis.

Kirklin sign

The Kirklin sign refers to a deformity of the normal gastric bubble on an upright chest radiograph due to a mass lesion of the gastric cardia or fundus.

Gage sign

The Gage sign is a V-shaped lucent defect at the lateral portion of the epiphysis and/or adjacent metaphysis. It is pathognomonic for Legg-Calve-Perthes disease. It may occur early in the disease and is one of the five indicators of a worse prognosis

Shmoo sign

Shmoo sign refers to the appearance of a prominent, rounded left ventricle and dilated aorta on a plain PA chest radiograph giving the appearance of Shmoo, This sign is indicative of left ventricular enlargement.

Roesler sign

Roesler sign is the name given to the inferior rib notching seen in coarctation of the aorta.