ABSTRACTMucormycoses is a fungus which increasingly has been reported as a cause of opportunistic infection during the last 40 years. This infection is most commonly associated with underlying predisposing conditions, particularly diabetic ketoacidosis, hematologic and other malignancies, steroid therapy, broad-spectrum antibiotic therapy, or various acquired and hereditary immunodeficient disease states. The present report is that of a previously healthy patient with acute renal failure secondary to a postviral rhabdomyolysis syndrome, who received corticosteroids and developed unsuspected and undiagnosed systemic mucormycosis. Autopsy revealed that he died as a consequence of a massive pulmonary hemorrhage due to disseminated invasive mucormycosis, involving both the lungs and kidneys. A review of the literature reporting disseminated mucormycosis in association with renal failure is provided. Mucormycosis should be considered in immunocompromised patients with renal failure and fevers of unknown origin so that early diagnosis and prompt surgical and medical therapy may be instituted.