A 25 years old basket ball player suddenly collapsed while undergoing an athletic event and died. At autopsy the septum was hyperophied. The most probable diagnosis is -

Ref:Harrison&;s 19th E pg 1568. Most probably it is HOCM. Patients with hyperophic cardiomyopathy have an increased risk of sudden cardiac death from ventricular tachyarrhythmias. Vigorous physical activity and competitive spo are prohibited.