amastia https://github.com/monarch-initiative/mondo/issues/4449 https://rarediseases.info.nih.gov/diseases/9489/absent-breasts-and-nipples BNAH1 GARD:0024536 Absence of one or both mammary glands. amastia MESH:C535565 breasts and/or nipples, aplasia or hypoplasia of, 1 NCIT:C118459 absent breasts and nipples MONDO:0007238 athelia complete absence of breasts SCTID:75474006 isolated congenital breast hypoplasia/aplasia