The pathognomonic laboratory symptoms of MYH9-related disorders are macrothrombocytopenia (a decrease in platelet counts with a simultaneous increase in their size) in combination with the so-called Döhle-like bodies (basophilic cytoplasmic inclusions in neutrophils, monocytes and eosinophils, which comprise aggregates of a mutated heavy chain of myosin IIA)11,12. Here, MYH9 is linked to Macrothrombocytopenia.