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Location. The majority of parathyroid adenomas are juxtathyroid and located immediately posterior or inferior to the thyroid gland. Superior gland parathyroid adenoma may fall posteriorly in the tracheo-oesophageal groove or para-oesophageal location or even fall inferior as far as the mediastinum 12.Up to 5% of parathyroid adenomas can occur in ectopic locations. Common ectopic locations include 1,12 1  : mediastinum.uperior gland parathyroid adenoma may fall posteriorly in the tracheo-oesophageal groove or para-oesophageal location or even fall inferior as far as the mediastinum 12. Up to 5% of parathyroid adenomas can occur in ectopic locations. Common ectopic locations include 1,12 :
Even the location of the glands is variable. Although theyâre usually located behind the thyroid, they can be in the lower regions of the neck and even the thorax. Parathyroid glands produce parathyroid hormone that stimulates the breaking down of bone to increase calcium levels in the blood.