Urothelial carcinoma arising within a congenital bladder diverticulum in an adult male: A rare case report and literature review

Introduction and importance: Neoplasms arising from vesical diverticula are rare clinical entities known as intradiverticular bladder tumors. The bladder diverticulum harboring these tumors can be congenital or acquired. Congenital diverticula are predominantly found in children and are extremely rare in adults. Case presentation: A 56-year-old male admitted to our hospital with a 10-days history of painless gross hematuria and blood clots. Physical examination and vital signs were unremarkable. Radiologic examination revealed a bladder diverticulum with a mass inside it. Pathological examination confirmed the diagnosis of TCC tumor arising from congenital bladder diverticula. Clinical discussion: While intradiverticular bladder tumors account for only 1% of all bladder tumors and the finding of a congenital bladder diverticulum is a rare anomaly in adults, the concurrence of a tumor arising within a congenital bladder diverticulum is almost non-existent in adults. Conclusion: We aimed to present a rare case of urothelial carcinoma arising from a congenital diverticulum in an adult while highlighting the diagnostic and therapeutic options used in managing such tumors.