Table 1.

Urachal cancer staging systems.

	Stage I	Stage II	Stage III	Stage IV
Sheldon staging system	Urachal cancer confined to urachal mucosa	Urachal cancer with invasion confined to urachus itself	Local urachal cancer extension to: A) bladder; B) abdominal wall; C) peritoneum	Metastatic urachal cancer to: A) lymph nodes; B) distant sites
Mayo staging system	Tumor confined to the urachus and/or bladder	Tumor extending beyond the muscular layer of the urachus and/or the bladder	Tumors infiltrating the regional lymph nodes	Tumor infiltrating nonregional lymph nodes or other distant sites