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[Two cases of non-functional gonadotroph adenoma pituitary apoplexy following GnRH-agonist treatment revealing gonadotroph adenoma and pseudopituitary apoplexy after GnRH administration].

We report here two cases of pituitary apoplexy or pseudoapoplexy revealing a gonadotroph adenoma. A 69-year-old man, who had just started antiandrogen treatment (Gn-RH agonist) for prostatic cancer, was admitted to neurosurgery emergency because of increasing headache and visual impairment. The CT-scan disclosed the presence of a large pituitary mass with lateral invasion of the left cavernous sinus. Hormonel testing showed panhypopituitarism. A few days later, diabetes insipidus appeared. The patient first received corticosteroid therapy and underwent surgical adenomectomy. Immunostaining of the tumor tissue was positive for FSHbeta, confirming the diagnosis of gonadotroph adenoma. Three months after surgery, the endocrine evaluation showed pituitary insufficiency. An 81-year-old man complained of mnemonic disorders. The CT-scan revealed a pituitary mass without extension. The Ophthalmological examination showed left temporal upper quadranopsia. Endocrinological tests with administration of GN-HR triggered headache and vomiting. A second CT-scan was unchanged. Hormone testing revealed increased serum levels of FSH and decreased serum levels of LH. Surgical management of the primary tumor was undertaken due to the visual field alteration. Immunohistochemical studies confirmed the diagnosis of gonadotroph FSHbeta adenoma.

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