Fig. 1. A 70-year-old man with diabetes mellitus, hypertension, and coronary heart disease. a: Pulmonary oedema and small bilateral pleural effusion are shown by posterior-anterior radiography; b: Small bilateral pleural effusion are shown by chest computer tomography.
Fig. 2. A 72-year-old man with very severe chronic obstructive pulmonary disease, type II respiratory failure and cor pulmonale. No pleural effusion is found on posterior-anterior radiograph ( a ) and chest computer tomograph ( b ).