title: Sonography in the diagnosis of retroperitoneal fibrosis.
abstract: The ultrasonic appearance of retroperitoneal fibrosis is characteristic: a smooth-bordered and relatively echo-free mass anterior to the sacral promontory. Sonography can be used to confirm the diagnosis, follow response to therapy and detect hydronephrotic changes in the kidneys.
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D006869:Hydronephrosis / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D012185:Retroperitoneal Fibrosis / Q000175:diagnosis*; D014463:Ultrasonography