Myocardial infarction with ‘normal’coronary arteries (MINCA) typically occurs in the under-50s1. Usually there is no history of angina or previous myocardial infarction (MI), and risk factors for ischaemic heart disease (IHD) may be absent2. Symptoms and electrocardiographic (ECG) findings are similar to those of MI with angiographic coronary disease, though the infarct sizes tend to be smaller3. The rate of post-MI complications, such as malignant arrhythmias, heart failure and hypotension, is lower and the long-term prognosis is more favourable3, 4. MINCA can be classified into four groups based on risk factors for IHD and angiographic findings: