syndromic disease congenital hypogonadotropic hypogonadism hypogonadotropic hypogonadism-retinitis pigmentosa syndrome https://github.com/monarch-initiative/mondo/issues/6744 https://github.com/monarch-initiative/mondo/issues/6752 https://github.com/monarch-initiative/mondo/issues/6878 https://www.malacards.org/card/hypogonadotropic_hypogonadism_retinitis_pigmentosa_syndrome MONDO:0016386 This syndrome is characterized by the association of hypogonadotropic hypogonadism (with primary amenorrhea and lack of secondary sexual development) and retinitis pigmentosa. It has been described in two sisters born to nonconsanguineous parents. UMLS:C2931722 MEDGEN:419479 Orphanet:2235 GARD:0001234 Chang-Davidson-Carlson syndrome MESH:C538075