Abstract
Correlation of the gross urethral anatomy with the roentgen anatomy and physiology has shown tremendous variation in the appearance of the normal urethrogram. Distinct urethrographic landmarks exist at the base plate, intermuscular incisura and urogenital diaphragm. Dynamic physiology affects these structures to cause changing positions of the trigonal plates, varying urethral widths and different urethral configurations during the stages of voiding. Sequential voiding spot films are essential in understanding the resultant urethrographic appearance. Knowledge of the normal urethrographic anatomy and physiology is required to prevent the interpretation of the normal as pathologic.
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