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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 :
The parathyroid glands are four small oval bodies located at the posterior surface of the thyroid gland (close to the middle and inferior ends of the lateral thyroid lobes-but a bit variable; the inferior pair may actually be located in the mediastinum).he parathyroid glands are four small oval bodies located at the posterior surface of the thyroid gland (close to the middle and inferior ends of the lateral thyroid lobes-but a bit variable; the inferior pair may actually be located in the mediastinum).