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

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