“…At the time of admission to the emergency room, a large amount of pleural fluid was observed on CT, and the size of the hepatic cyst had decreased ( Fig. 1C ), resulting in empyema thoracis as the hepatic cyst had ruptured through the diaphragm and into the thoracic cavity [ 1 , 2 ]. The patient was immediately treated with closed-tube thoracostomy.…”