ROENTGENOLOGICAL EVALUATION OF BLADDER NECK OBSTRUCTION

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Abstract
1. The roentgen features of bladder neck narrowing, contracture, anterior defect and posterior defect are not valid criteria in the diagnosis of bladder neck obstruction. 2. Bladder neck contracture is a manifestation of urethral width and position of the trigonal plates. 3. Bladder neck diameter varies with the age of the patient and the stage of voiding, and is as wide or wider than other physiologic areas of urethral narrowing in the patients of this study. 4. Anterior and posterior defects of the bladder neck are a manifestation of urethral caliber, urethral configuration and position of the trigonal plates. 5. Vesicoureteral reflux, bladder trabeculation and residual urine are not always valid indications of bladder neck obstruction. Other causes should be sought in their etiology. 6. Voiding cystourethrographies should be performed in the lateral or steep oblique position and with sequential filming.

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