Chest computed tomography of extrapleural hematoma due to bleeding from an intercostal artery

(A) Chest computed tomography (CT) scan shows a large right postero-lateral extrapleural biconvex mass with high attenuation clotted blood. The extrapleural mass is delineated by extrapleural fat (arrowhead). The arrow shows the compressive right lower lobe atelectasis with visible air-bronchograms. (B) Extrapleural hematoma a few days later in the same patient. CT scan shows liquefaction of the hematoma with a hematocrit effect (arrowhead). The arrow shows the extrapleural fat line.