Any hypogonadotropic hypogonadism in which the cause of the disease is a mutation in the FGFR1 gene. The disease is MONDO_0007844 (hypogonadotropic hypogonadism 2 with or without anosmia). Also known as: FGFR1 hypogonadotropic hypogonadism, hypogonadotropic hypogonadism caused by mutation in FGFR1.