PT - JOURNAL ARTICLE AU - W G McCluggage AU - C F Russell AU - P G Toner TI - Parathyroid cyst of the thymus. AID - 10.1136/thx.50.8.913 DP - 1995 Aug 01 TA - Thorax PG - 913--914 VI - 50 IP - 8 4099 - http://thorax.bmj.com/content/50/8/913.short 4100 - http://thorax.bmj.com/content/50/8/913.full SO - Thorax1995 Aug 01; 50 AB - 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.