Palla sign
Palla sign (1983) right descending pulmonary artery enlargement and 'sausage-shaped' appearance as a potential sign of pulmonary embolism on chest XR
Tag pulmonary artery
Antonio Palla
Antonio Palla (born 1949), Italian respiratory physician known for Palla sign and major contributions to pulmonary embolism and respiratory medicine.
Chang sign
Chang sign (1965) Dilated descending pulmonary artery associated with pulmonary infarction and pulmonary hypertension following pulmonary embolism