Hypogonadotropic Hypogonadism 25 with Anosmia, also known as hh25, is related to hypogonadotropic hypogonadism 2 with or without anosmia. An important gene associated with Hypogonadotropic Hypogonadism 25 with Anosmia is NDNF (Neuron Derived Neurotrophic Factor). Affiliated tissues include pituitary and olfactory bulb, and related phenotypes are cryptorchidism and primary amenorrhea