Primary signet ring cell carcinoma of the urinary bladder and colon are rare disease entities that are aggressive, difficult to manage, and portend a poor prognosis. We present a case report of a 25-year-old man born with an imperforate anus who developed signet ring cell carcinoma of the pulled-through sigmoid colon that mimicked a primary invasive bladder tumor. Despite radical surgery and adjuvant radiation, the patient died of his disease 7 months after surgery. Copyright (C) 2000 Elsevier Science Inc.
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