GH1 and adenoma: Pathological analysis revealed a non-functioning pituitary adenoma in 5 cases (31.25%), meningioma in two cases (12.5%), both prolactin and growth hormone-producing adenoma twice (12.5%), and a single case each of somatotropic adenoma (6.25%), corticotropic adenoma (6.25%), granular cell tumor of the infundibulum (6.25%), and spindle-cell oncocytoma (6.25%).