Status post removal of right and left chest tubes and mediastinal drain since the prior exam. There is a crescentic lucency along the margin of the liver at the inferolateral aspect of the right hemithorax, which is likely the interface with fat rather than a true deep sulcus sign. However, attention on follow-up is suggested to exclude the possibility of a basilar pneumothorax. A small right pleural effusion is also noted.
Simple pneumothorax (Uncertain) Simple pleural effusion (Present)