Diagnosis and treatment of mediastinal ectopic thyroid tissue with normally located thyroid gland and primary hyperparathyroidism: a case report.

Mediastinal ectopic thyroid tissue (ETT) is rare entity, accounting for 1% of all mediastinal tumours. A 53-year-old lady, presented with cough and atypical chest pain. A computed tomography (CT) scan of chest showed a 95 mm × 75 mm × 115 mm tumour mass; CT guided biopsy of mediastinal mass showed ETT.