Renal ultrasound for the detection of mass lesions, diffuse renal disease, and hydronephrosis is widely accepted. Less attention has been devoted to sonography of the lower urinary tract; however, recent studies have shown that ultrasound is useful in imaging the renal pelvis, ureters, bladder, and urethra. A variety of instruments are now used to image these areas, and a number of pathologic and physiologic processes can now be imaged. The normal anatomy of the lower urinary tract as visualized by ultrasound and a number of abnormalities which involve this region are discussed.
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