A Case Presenting with Magnesium Oxide Broncholiths

A 95-year-old woman was transferred to our hospital because of a suspected intrabronchial foreign object observed on chest computed tomography (CT).The patient had been administered crushed magnesium oxide tablets for constipation.Chest CT showed multiple round shadows up to 4 mm in size, with high-density CT values in the left lower lobe bronchus and partial atelectasis of the left lower lobe (Picture 1).Bronchoscopy revealed broncholiths with white granular surfaces (Picture 2).Five broncholiths were removed via bronchoscopy.Energy-dispersive X-ray spec-