Non-compaction of the left ventricle or spongy myocardium is a rare congenital 
cardiomyopathy which is characterized by impaired endomyocardial morphogenesis, 
hypertrophy of left ventricular myocardium with prominent trabeculation, and 
deep inter-trabecular recesses. According to WHO classification (1995) this 
disease belongs to unclassified cardiomyopathies. Main clinical signs of 
ventricular non-compaction are heart failure, ventricular arrhythmias, systemic 
and pulmonary embolism. Echocardiography which is a basic method of diagnosis 
can reveal double layer structure of thickened left ventricular wall and 
multiple prominent trabeculation with wide inter-trabecular spaces. Predominant 
localizations of pathological process are region of cardiac apex, inferior and 
lateral left ventricular walls. Treatment of patients with ventricular 
non-compaction concentrates on elimination of its main clinical symptoms.