Hemothorax Causes: Trauma (MC), Tumor, Tuberculosis Massive hemothorax is usually the result of major pulmonary vascular injuries or major aerial wounds while minor injuries can cause small hemothorax Diagnosis Diagnosis is made by needle aspiration of pleural fluid Chest X-Ray : To assess the presence and extent of pleural cavity collection A supine position with horizontal X-Ray beam (Decubitus position) is better than erect film, as about 400-500 ml of blood may be hidden by diaphragm on upright chest X-Ray Ref: Bailey and love 27th edition Pgno : 366