Left ventricular diverticulum is a rare congenital malformation consisting of a localized protrusion of the endocardium and myocardium from the free wall of the left ventricle (LV). The prevalence of the disease is 0.26% in nonselected patients who underwent cardiac catheterization. It is believed that the etiology is an intrinsic abnormality developing during embryogenesis. It often does not cause any symptoms. We report a case of isolated left ventricular diverticulum with complaints of transient ischemic attack.