Isolated Congenital Hypogonadotropic Hypogonadism, also known as isolated gonadotropin-releasing hormone deficiency, is related to isolated gonadotropin-releasing hormone deficiency and pituitary apoplexy. An important gene associated with Isolated Congenital Hypogonadotropic Hypogonadism is GNRHR (Gonadotropin Releasing Hormone Receptor). Affiliated tissues include pituitary and pineal.