A case is described in which a large tumour was detected in the posterior mediastinum on a routine chest X-ray. Although the parathormone level was very high, no clinical nor radiographic signs of hyperparathyroidism were present. The tumour was removed by lateral thoracotomy and proved to be a parathyroid adenoma. Postoperatively the serum calcium returned to a normal level.
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An exceptionally rare case of a giant parathyroid adenoma with carcinoma-like presentation.
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