1. Woodburne RT. Anatomy of the excretory tract. In: Lapides J (ed) Fundamentals of Urology. Philadelphia, Saunders, 1976
2. Kaiman MA. Radiologic soft tissue shadows of the pelvis: another look. AJR 1978; 130: 493–498
3. Cunningham JH. The diagnosis of stricture of the urethra by the roentgen rays. Trans Am Assoc Genitourin Surg 1910; 5: 369–371
4. Talarico RD, Patel RC, Lavengood RW. Cystourethrogra-phy: reversible and irreversible damage to the bladder. NY StateJ Med 1979;2080–2082
5. Shopfner CE. Clinical evaluation of cystourethrographic media. Radiology 1970; 88: 491–497