ICD-11 definition : Sebastian syndrome is one of the MYH9 syndromes (a group that includes four clinical
forms with similar manifestations resulting from mutations in the MYH9 gene: May-Hegglin
anomaly and Fechtner and Epstein syndromes), which are characterized by a macrothrombocytopenia
that is usually severe but paradoxically results in few if any symptoms.;
Sebastian syndrome is one of the MYH9 syndromes (a group that includes four clinical
forms with similar manifestations resulting from mutations in the MYH9 gene: May-Hegglin
anomaly and Fechtner and Epstein syndromes), which are characterized by a macrothrombocytopenia
that is usually severe but paradoxically results in few if any symptoms.