Left ventricular noncompaction

Short-axis view of a two-dimensional echocardiogram at endsystole in a patient with isolated left ventricular noncompaction. The ratio of noncompacted myocardium (white line) to compacted myocardium (red line) is 2.2:1. A ratio ≥2:1 at end-systole with thickening of the myocardial wall is considered to be diagnostic of left ventricular noncompaction. A ratio ≥2:1 is occasionally seen in patients with dilated cardiomyopathy, but there is no thickening of the myocardial wall.