Pituitary enlargement, hypertrichosis and blunted growth hormone secretion in primary hypothyroidism.

Pituitary hyperplasia, hypertrichosis and blunted growth hormone (GH) secretion were observed in three children with untreated primary hypothyroidism. These abnormalities disappeared and improved after thyroid hormone therapy. The recognition of these associations may eliminate unnecessary surgery and GH therapy and lead to the choice of thyroid hormone replacement therapy.