CT of retrorenal fluid collections.
D001202:Ascitic Fluid; D005122:Exudates and Transudates; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging*; D010529:Peritoneal Cavity / Q000000981:diagnostic imaging; D012187:Retroperitoneal Space / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed