A 30-year-old male presents with left-sided flank pain and hematuria. He has a history of gastric bypass surgery for obesity. An abdominal CT scan reveals multiple left renal calculi. What could be the underlying cause of his condition?
The presence of kidney stones in a patient with a history of gastric bypass surgery suggests the possibility of enteric hyperoxaluria. This condition occurs when fat malabsorption leads to increased absorption of dietary oxalate, which is then excreted by the kidneys, potentially forming calcium oxalate stones. Management would involve dietary modifications to limit oxalate intake, increase dietary calcium, and maintain good hydration.