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Parathyroid cyst of the thymus.
  1. W G McCluggage,
  2. C F Russell,
  3. P G Toner
  1. Department of Histopathology, Royal Group of Hospitals, Belfast, UK.


    A case is described of primary hyperparathyroidism in a patient with both a parathyroid cyst within the thymus gland and a concomitant parathyroid adenoma. The parathyroid adenoma contained microcystic areas of degeneration, and it is thought that the parathyroid cyst reflected degenerative change in a pre-existing adenoma. Parathyroid cyst should be considered in the differential diagnosis of cystic lesions within the thymus. Fine needle aspiration and parathyroid hormone assay on cyst fluid may provide a preoperative diagnosis.

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