Adenovirus-Associated Rhabdomyolysis Presenting With Gastrointestinal Symptoms and Preserved Renal Function in an Immunocompetent Young Adult: A Case Report.

Introduction: Rhabdomyolysis is characterized by skeletal muscle breakdown resulting in the release of intracellular contents into the circulation. Although trauma, medications, and metabolic disorders are common causes, viral infections are increasingly recognized as potential triggers. Case Presentation: A 26-year-old previously healthy male presented with a 2-day history of abdominal pain, diarrhea, vomiting, bilateral thigh pain, and dark urine. Laboratory evaluation demonstrated severe rhabdomyolysis with a peak creatine phosphokinase (CK) level of 25,036 U/L, elevated aminotransferases, and preserved renal function. A stool gastrointestinal multiplex polymerase chain reaction (PCR) panel was positive for adenovirus and did not identify other enteric pathogens. Alternative etiologies, including significant recent exertion, medication-related muscle injury, toxin exposure, autoimmune myopathy, and inherited metabolic disorders, were considered but were not supported by the clinical history or disease course. The patient was treated with early intravenous isotonic fluid 1L every 6 hours and experienced progressive biochemical and clinical improvement without developing acute kidney injury. Discussion: Adenovirus-associated rhabdomyolysis is an uncommon but increasingly recognized clinical entity in adults. The pathogenesis may involve direct viral muscle injury, immune-mediated inflammation, and contributory factors such as dehydration associated with gastrointestinal illness. Although adenovirus was considered the most likely precipitating factor in this case, a definitive causal relationship cannot be established. Conclusion: This case highlights probable adenovirus-associated rhabdomyolysis in an immunocompetent young adult presenting predominantly with gastrointestinal symptoms and preserved renal function despite marked creatine kinase elevation. Early recognition, careful evaluation of alternative etiologies, and prompt supportive management are important for preventing complications and achieving favorable outcomes.