The value of transurethral sonography in tumours of the urinary bladder.

The authors report on their first experience obtained in the field of transurethral sonography in cases of tumours of the urinary bladder. Sonography is a method without complication and risks. TNM classification of urinary bladder tumours is possible. A special advantage of this method of investigation is that sonography can be performed directly before transurethral tumour resection. Moreover, during the postoperative period, sonography can be combined with any kind of control cystoscopic investigation. The determination of the depth of infiltration and extension of the tumour is a prerequisite of therapeutic procedures in cases of cancer of the bladder.