[Ectopic mediastinal parathyroid adenoma resected by video-assisted thoracic surgery with intraoperative methylene blue infusion].

We report a case of 26-year-old man treated for ectopic mediastinal parathyroid adenoma with videoassisted thoracic surgery and perioperative methylene blue intravenous injection. The patient had elevated serum calcium levels, and a history of recurrent urinary stone seizures from 8 years ago. Hypercalcemiadue to the hyperparathyroidism was suspected and am ectopic parathyroid adenoma in the mediastinum was identified by computed tomography (CT) and magnetic resonance imaging(MRI).Thoracoscopic extirpation of mediastinal parathyroid adenoma was scheduled with the help of tumor staining by methylene blue intravenous injection. The lesion was identified easily during surgery, andthe thoracoscopic surgery could be safely performed. The postoperative course is well, and hypercalcemia was improved. The ureteral stone seizures did not occur subsequently.