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Cystic parathyroid adenoma mimicking thyroid adenoma: A rare case with review of literature

Parathyroid cyst is one of the rare differential diagnosis of cystic neck mass. It is often mistaken as a thyroid swelling. Functional parathyroid cyst secretes parathyroid hormone producing hypercalcemia. Here, we report a case of cystic parathyroid adenoma, which was mistaken as thyroid adenoma and operated upon. Reevaluation of the pathology specimen has given clue to the presence of parathyroid tissue. Ultrasonographic evaluation of cystic neck lesion by experienced radiologist and technetium 99m sestamibi scan helps in the diagnosis. Biochemical evaluation for hyperparathyroidism should be done in all such suspected cystic neck lesion as they may be asymptomatic for hypercalcemia.