Ceftriaxone pseudolithiasis detected by computed tomography and followed up until resolution

Introduction: Ceftriaxone is a third-generation cephalosporin antibiotic that has been widely used to treat various infectious diseases. We report a case of ceftriaxone pseudolithiasis that was detected by computed tomography (CT) and followed up until it was resolved. Case: A 76-year-old woman with diabetes mellitus and renal impairment, but no history of gallstones, was diagnosed with septic shock due to renal and lung abscesses and treated with ceftriaxone. On day 22 after admission, abdominal CT revealed a gallstone, which increased in size up to day 50. Ceftriaxone was stopped on day 50, and the gallstone resolved completely after 10 weeks. Conclusion: Ceftriaxone pseudolithiasis should be cautiously considered, specifically in a patient with renal impairment and a prolonged treatment period.