Sebastian syndrome with abnormal platelet response to ristocetin

Rachel Redman, Sara M. Shunkwiler, Neil S. Harris, Amos Kedar, William L. Clapp

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Background: Sebastian syndrome is characterized by enlarged platelets and Döhle-like body leukocyte inclusions. This syndrome is an MYH-9-related disease, a group that also includes May-Hegglin anomaly and Fechtner syndrome. The differential diagnosis of the MYH-9 diseases requires ultrastructural studies. Certain in vitro aggregation responses may be abnormal in these conditions. Observations: A 6-month-old boy presented with macrothrombocytopenia but no overt bleeding tendency. Giant platelets and Döhle-like body leukocyte inclusions were present in blood smears from both the patient and his mother. Electron microscopy confirmed ultrastructural features consistent with Sebastian syndrome. Platelet aggregation studies were normal except for an impaired response to the agonist ristocetin. Conclusions: In this patient peripheral blood analyses and platelet aggregation studies revealed disease features shared with the Bernard-Soulier syndrome, but this syndrome was excluded by cell-surface glycoprotein analysis.

Original languageEnglish (US)
Pages (from-to)19-23
Number of pages5
JournalLaboratory Hematology
Issue number3
StatePublished - Sep 2008
Externally publishedYes


  • Electron Microscopy
  • MYH-9
  • Macrothrombocytopenia
  • Platelet aggregation
  • Sebastian syndrome

ASJC Scopus subject areas

  • Hematology
  • Clinical Biochemistry
  • Biochemistry, medical


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