Abstract
Inherited thrombocytopenia is a rare phenomenon. MYH9-related disorder (MYH9-RD) is one such pathology characterized by thrombocytopenia and giant platelets with the presence of cytoplasmic inclusion bodies in the granulocytes. The condition is often misdiagnosed as immune thrombocytopenia (ITP) due to its similarities in clinical phenotype and often no associated secondary causes. Ensuing treatments, frequently unnecessary, may predispose to adverse outcomes or perceived a lack of improvement. We report a young lady in her 20s who was eventually found to have MYH9-RD after her second pregnancy. A strong family history of thrombocytopenia, revision of her blood film (presence of giant platelets with no obvious platelet clumping, and the presence of Dohle body-like inclusions in the neutrophils), a lack of response to corticosteroids (treatment for ITP) eventually pointed us to this diagnosis. This case report aims to educate physicians regarding MYH9-RD as a rare but important entity when approaching chronic thrombocytopenia.
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