Cavitary Lesions in a 41-Year-Old Man

A 41-year-old Venezuelan man with no past medical history was admitted last October for cough productive of blood-tinged sputum, fevers, weight loss of 25 lbs. during the previous three weeks. He was found to have acute renal failure, with a creatinine level of 3.59 mg/dL, active urinary sediment with many dysmorphic red blood cells (RBCs), no casts, proteinuria of about ...