Non-compaction cardiomyopathy (spongiform cardiomyopathy) is a primary disorder of the ventricular muscle of unknown cause, which can occur at any age, often between 20 to 40 years of age. It affects mainly men, and can be asymptomatic or present with symptoms of heart failure, arrhythmias or embolic events. Color Doppler echocardiography and nuclear magnetic resonance (cMRI) are the most commonly used diagnostic methods. No specific treatment is currently available, and it is treated similarly to patients with heart failure. We report two cases of con compacted myocardium with pre-excitation syndrome.