Appendiceal adenocarcinoma presenting as a bladder tumor

We present a case of an appendiceal adenocarcinoma that invaded the urinary bladder, which was preoperatively mistaken for urachal adenocarcinoma. The patient underwent open removal of the umbilicus, urachus, partial cystectomy and bilateral pelvic lymph node dissection. Intraoperatively the tumor was noted to involve the appendix, and so an appendectomy was also performed. The pathology showed an appendiceal adenocarcinoma invading the bladder wall. Urologists must have a high degree of suspicion for spread from a gastrointestinal primary when adenocarcinoma is found within the urinary bladder.