1. Mucous adenocarcinoma of urinary bladder;Mostofi;Cancer,1955
2. Transitional-cell carcinoma of the urachal apex;Fisher;Cancer,1958
3. Umbilical granulomas, pilonidal disease, and the urachus;Steck;Surg., Gynec. & Obst.,1965
4. Congenital anomalies in region of umbilicus;Trimingham;Surg., Gynec. & Obst.,1945
5. Carcinoma of the urachus;Cornil;J. Urol.,1967