A 65-year-old woman presents with acute oliguric renal failure. She had a history of cervical cancer for which she was treated with hysterectomy and pelvic irradiation. Examination : She has normal jugular venous pressure, is normotensive without orthostasis, and has a benign abdominal examination. Her urinalysis reveals a specific gravity of 1.010, with no cells or casts on microscopy. Urinary FE Na is 2%, and the Na level is 35 mEq/L.
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