Category Radiology
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Palla sign

Palla sign (1983) right descending pulmonary artery enlargement and 'sausage-shaped' appearance as a potential sign of pulmonary embolism on chest XR
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Hampton hump

The Hampton hump is a well-defined pulmonary pleural based opacity representing hemorrhage and necrotic lung tissue in a region of pulmonary infarction caused by acute pulmonary embolism.
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Chang sign

Chang sign (1965) Dilated descending pulmonary artery associated with pulmonary infarction and pulmonary hypertension following pulmonary embolism