A 54-year-old woman was admitted to our hospital complaining of gross hematuria and difficulty urinating. Cystoscopy revealed a tumor 4 cm in size with calcification on top of the bladder. After diagnosis of urachal carcinoma by transurethral resection of the bladder, partial cystectomy with en bloc resection of the median umbilical ligament and pelvic lymphadenectomy was performed. Pathological diagnosis confirmed urachal carcinoma, pT3b, ly1, v0, pN1, RM0. TS-1 and cisplatin chemotherapy (TS-1 at 100 mg/day on days 1-21, CDDP at 60 mg/m on day 8) was administered. On day 13, the patient was admitted because of consciousness disorder (Glasgow Coma Scale E2V1M4). Hyponatremia (Na 109 mEq/l) and renal excretion of sodium were present and the patient was diagnosed with the syndrome of inappropriate antidiuretic hormone secretion (SIADH) induced by chemotherapy. Serum sodium level and her consciousness level gradually improved after administration of 3% saline. SIADH caused by chemotherapy containing cisplatin is a relatively rare, but potentially serious adverse effect that requires close attention.
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