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Location and frequency of 155 parathyroid adenomas found at reoperation. (1) Tracheoesophageal groove: 28 (18%); (2) anterior mediastinum/thymus: 36 (23%); (3) entopic upper position: 28 (18%); (4) entopic lower position: 25 (16%); (5) intra-thyroidal: 3 (2%); (6) undescended: 14 (10%); (7) carotid sheath: 13 (8%); (8) retroesophageal: 4 (3%); (9) other mediastinal location: 4 (3%)
