MYH9 and blood platelet disease: The new pathogenic stop codon in the coiled‐coil domain, Gln890Arg*, leading to removal of 1,070 amino acids in the MYH9 protein was found in an 86‐year‐old man who was originally diagnosed as having an “unclassified platelet disorder”, with mild thrombocytopenia (88 × 109/L), no extra‐hematological manifestations and a pathologic bleeding score due to major bleeding after surgery.