Fulminant Methicillin-Sensitive Staphylococcus aureus Pneumonia in a Steroid-Treated Patient With End-Stage Renal Disease: A Rapidly Fatal Case.

A man in his 50s with end-stage renal disease (ESRD) secondary to gouty nephropathy and on chronic methylprednisolone therapy presented with acute-onset weakness, severe hyperkalemia, metabolic acidosis, and lactic acidemia. Emergency hemodialysis was initiated; however, within hours, he developed respiratory failure and progressive shock. Imaging revealed rapidly evolving right-dominant pneumonia. Despite escalation to broad-spectrum antibiotics, mechanical ventilation, and veno-arterial extracorporeal membrane oxygenation (VA-ECMO), the patient died within 28 hours of admission. An autopsy revealed fulminant necrotizing pneumonia due to methicillin-sensitive  (MSSA), with Gram-positive cocci present in the bronchial lumen and necrotic tissue. Histological findings included bronchial wall destruction, pulmonary edema, and alveolar hemorrhage. Additional findings included bilateral renal atrophy with arteriosclerosis, but no evidence of gouty tophus or urate deposition. This case illustrates the potential for MSSA to cause rapidly progressive necrotizing pneumonia in immunocompromised hosts. The fulminant nature of the disease emphasizes the importance of early recognition, consideration of toxin-producing strains such as PVL-positive , and the initiation of appropriate antimicrobial and supportive therapy. Despite aggressive interventions, the patient succumbed to multiorgan failure, highlighting the lethality of this condition in vulnerable populations.