obsolete_GMS syndrome true Goniodysgenesis - intellectual disability - short stature ICD10:Q87.8 3.41.0 http://purl.obolibrary.org/obo/MONDO_0007679 OMIM:138770 Replaced with Mondo term. orphanet GMS syndrome describes an extremely rare syndrome involving goniodysgenesis, intellectual disability and short stature in addition to microcephaly, short nose, small hands and ears, and that has been seen in one family to date. There have been no new cases reported since 1992.