Composite Paraganglioma and Neuroblastoma of the Urinary Bladder: A Rare Histopathological Entity.

Paraganglioma of the urinary bladder is an uncommon clinical entity. Neuroblastoma of the urinary bladder is another rare tumor with only 7 reported cases, all in children. This report presents the case of a composite paraganglioma and neuroblastoma in a 45 year-old male who presented with dysuria and flank pain. On the computerized tomography scan, the bladder wall overlying the tumor was smooth and the mass had a large exophytic component. The initial diagnosis was paraganglioma on transurethral resection. Following partial cystectomy and bilateral pelvic lymph node dissection, pathology confirmed a composite tumor consisting of paraganglioma and neuroblastoma. To our knowledge, this is the first report of such a composite tumor involving the bladder.