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Table 1 Mayo staging system for urachal carcinoma

From: Surgical and chemotherapeutic experience regarding a urachal carcinoma with repeated relapse: case report and literature review

Stage Definition
I Tumors confined to the urachus and or bladder
II Tumors extending beyond the muscular layer of the urachus or the bladder
III Tumors infiltrating the regional lymph nodes
IV Tumors infiltrating non-regional lymph nodes or other distant sites