Biventricular Myocardial Noncompaction

The isolated noncompacted ventricular myocardium (NCVM), characterized by excessively prominent trabecular meshwork and deep intertrabecular recesses, is seen in the early period of embryogenesis. Clinical manifestations of NCVM are symptoms associated with depressed left ventricular systolic function, with ventricular arrhythmias, and with systemic embolization. Characteristics on echocardiography have been defined as absent coexisting cardiac abnormalities, non-compacted trabecular endocardium with deep endomyocardial spaces, predominant localisation of the trabeculation to mid-lateral, apical and mid-inferior segments, and a colour Doppler evidence of deep perfused intertrabecular recesses. We describe a case of isolated noncompaction of the left and right ventricular myocardium in a 17-year-old man who presented initially with palpitation and syncope.