A 77-year-old female with abdominal pain and ascites was admitted to our hospital. She had a past history of the postoperative pelvic irradiation for uterine cancer and subsequently suffered from neurogenic bladder. On admission, serum creatinine (s-Cr) and blood urea nitrogen (BUN) were elevated to 9.9 mg/dl and 131 mg/dl, respectively. However, both the ratio of BUN/s-Cr and creatinine in ascites/s-Cr were significantly elevated. The clinical manifestations of the present case were not typical for acute kidney injury. Furthermore, 2 days after urethral catheterization, both s-Cr and BUN were normalized (0.69 mg/dl and 10 mg/dl, respectively) and her symptoms had improved immediately. Therefore, we diagnosed her disease as spontaneous bladder rupture. We report a case with spontaneous bladder rupture mimicking acute kidney injury forty years after postoperative pelvic irradiation for uterine cancer.
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