syndromic disease skeletal dysplasia non-syndromic syndactyly synpolydactyly https://github.com/monarch-initiative/mondo/issues/3919 UMLS:C2699746 A joint presentation of syndactyly (fusion of digits) and polydactyly (production of supernumerary digits). MEDGEN:437845 SPD syndactyly type 2 NCIT:C75003 GARD:0005087 synpolydactyly MONDO:0021651 SCTID:84598000 Orphanet:93403 SCTID:715724002 polysyndactyly MESH:C538153 NCIT:C125597