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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 :
Recurrent laryngeal nerve and parathyroid relationship. Most common location of superior parathyroid (A) and inferior parathyroid (B) glands; shaded areas detail the most common distribution sites of the glands. Anatomy of the recurrent laryngeal nerve (RLN).n most cases, the inferior parathyroid glands become localized near the inferior poles of the thyroid, and the thymus continues to migrate toward the mediastinum. The superior parathyroid glands are derived from the fourth pharyngeal pouch and migrate together with the ultimobranchial bodies.