A 46-year-old Japanese male was admitted for the evaluation of severe hypertension. He was obese and had a eunuchoidal body habitus. Chromosomal analysis revealed a 46, XY/47, XXY karyotype. Serum LH, FSH and testosterone levels were low, indicating hypogonadotropic hypogonadism. Endocrinological dynamic tests disclosed presence of hypothalamic panhypopituitarism, partial diabetes insipidus, type 2 diabetes mellitus and low renin essential hypertension. Brain computed tomography and magnetic resonance imaging revealed intra- and extrasellar masses. Histological examination of the tissue obtained at transsphenoidal surgery showed a Rathke's cleft cyst (RCC). To the best of our knowledge, this is the first case report of mosaic Klinefelter's syndrome accompanied by symptomatic RCC, type 2 diabetes mellitus and low renin essential hypertension.
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