Hypogonadotropic Hypogonadism 20 with or Without Anosmia, also known as hh20, is related to hypogonadotropic hypogonadism 2 with or without anosmia. An important gene associated with Hypogonadotropic Hypogonadism 20 with or Without Anosmia is FGF17 (Fibroblast Growth Factor 17). Affiliated tissues include pituitary and ovary, and related phenotypes are osteoporosis and osteopenia