A large pelvic stone with cystic wall urothelial carcinoma in a 65 - year - old male: a case report

AbstractBackground:The case of a huge pelvic stone with cystic wall urothelial carcinoma is extremely rare. The disease has no specific clinical manifestation, and its formation mechanism is unclear. There is no relevant literature report at present.Case introduction:In this report, a 65-year-old male patient was admitted to the hospital due to frequent urination for more than 5 years and hematuria for half a year. After admission, computed tomography(CT) showed a high-density shadow mass with a diameter of 61mm in the pelvic cavity and soft tissue density at the edge. However, cystoscopy did not show any stones in the bladder or any neoplasms in the bladder wall. After the relevant preparations were completed, laparoscopic surgery was performed to remove the whole pelvic mass. Complete dissection of the cyst wall of the mass showed a giant stone with a smooth surface inside. Stone analysis revealed carbonate apatite and magnesium ammonium phosphate hexahydrate. At a 3-month follow-up, the patient was in good condition with no urination discomfort.Conclusions:The case of a huge high-density pelvic stone with cyst wall urothelial carcinoma is extremely rare. Combined with the examination after admission, it is speculated that it may come from "ectopic bladder" or normal bladder tissue, but the specific mechanism of the formation of this disease needs to be further studied. Our report can provide reference for similar cases of pelvic calculus in the future.