Abstract
Essential thrombocythemia (ET) is a chronic myeloproliferative neoplasm which can cause thrombohaemorrhagic complications usually involving microvasculature. Medium-sized arterial thrombosis has been reported, but coronary occlusion usually occurs with additional risk factors, for example, smoking, hyperlipidaemia and so on. We present a case of acute myocardial infarction (AMI) in a young man (29 years) with ET but without any coronary artery associated risk factors. He was successfully treated for his AMI and ET with cytoreductive treatment and has recovered well. Due to automated platelet counting, ET is being increasingly identified; early detection can prevent long-term complications, and patients can have normal life span.