The interface sign: a computed tomographic sign for distinguishing pleural and intra-abdominal fluid.
On computed tomographic scans of the upper abdomen the interface sign can help distinguish pleural and intra-abdominal fluid readily and accurately. A hazy interface between the fluid and liver or spleen is characteristic of pleural fluid. A sharp interface is characteristic of ascites. The interface sign has proved to be accurate in 30 consecutive cases.
D001202:Ascitic Fluid / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D010996:Pleural Effusion / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed