The radiological diagnosis of the sinus urogenitalis.

The mechanisms and disturbances in the differentiation of male and female genitalia are described in relation to a correct radiological diagnosis. The methods of investigations include the flushing technique and the catheter technique. The advantage of the flushing technique (retrograde injection of contrast medium under moderate pressure) is its minimal invasiveness. In the catheter technique the bladder is filled with the help of a second catheter or suprapubic puncture, and a micturating cystourethrogram is conducted. The authors use a combination of both methods, filling the lower section of the urogenital sinus with a catheter and the upper by intravenous pyelography accompanied at times with a suprapubic bladder puncture. Quality of the radiographic picture ensures visualisation of all the important structures, as demonstrated by the accompanying figures.