Roentgenographic findings include the shadow appears in pulmonary field(18/20), pleural effusion (6/20), decrease of lung markings(3/20)and elevation of the diaphragm, etc.
Indirect sign was reduced pulmonary vascular markings in 13 cases, subpleural infarction in 15 foci, pleural effusion in 6 cases, pulmonary hypertension in 3 cases.