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Pituitary adenoma composed of two compartments each secreting prolactin or growth hormone.

We report a case of pituitary adenoma with two compartments, i.e. a part within the sella turcica and a part infiltrating the sphenoid bone beneath the sella, producing growth hormone (GH) and prolactin. The patient had the amenorrhea-galactorrhea syndrome, but not acromegalic symptoms. Although the two compartments were united through a small dural perforation, immunohistochemical studies demonstrated that GH and prolactin were separately secreted from the intrasellar and extrasellar components, respectively. Somatotropic adenomas frequently produce prolactin, but it is unusual for these hormones to be secreted from distinctly different parts of the same lesion.