Autoimmune hypothyroidism presenting as pituitary hyperplasia.

Pituitary hyperplasia with hyperprolactinemia has been described as a rare presentation of primary hypothyroidism. A 12-y-old child presented with intermittent headache, easy fatigability, coarseness of facial features, and hoarseness of voice for 6 mo duration. Brain imaging findings showed pituitary hyperplasia; hormonal assessment revealed primary hypothyroidism and hyperprolactinemia. Pituitary hyperplasia regressed with thyroid hormone replacement therapy. This report describes an unusual case of pituitary hyperplasia with hyperprolactinemia secondary to primary hypothyroidism.