Computer assisted tomography of urachal abnormalities.

Three examples of urachal abnormalities are presented: two urachal cysts and one urachal carcinoma. These cases demonstrate the value of computed tomography in detecting urachal abnormalities, particularly if there is no communication between the bladder and the urachal remnant. The embryonic development of the bladder is discussed, particularly with reference to the development of urachal abnormalities.