Contributors: Aysha Mubeen and Cristina Magi-Galluzzi
A woman in her mid-60s with history of uterovaginal prolapse, status post hysterectomy, was incidentally noted to have a patent urachus at the bladder dome on cystourethroscopy. A CT scan showed a partially distended urinary bladder with a small vesicourachal diverticulum and focal calcifications at its apex. Partial cystectomy with excision of the entire urachus was performed. Gross examination showed a 3.2 cm cystic nodule with calcified cut surface. Images from the partial cystectomy are shown below.
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What is the correct diagnosis?
a. Mucinous cystadenoma
b. Villous adenoma
c. Mucinous cystic tumor of low malignant potential
d. Mucinous adenocarcinoma
e. Urothelial carcinoma