title: Early detection of pleural fluid.
abstract: Displacement of a sharp "costophrenic angle," rather than blunting of the "costophrenic angle," is emphasized as one of the earliest signs of pleural fluid. Examples of this sign are illustrated, and its pathophysiology is discussed.
mesh_terms: D006801:Humans; D010994:Pleura / Q000033:anatomy & histology / Q000000981:diagnostic imaging* / Q000503:physiopathology; D010996:Pleural Effusion / Q000000981:diagnostic imaging* / Q000503:physiopathology; D011859:Radiography