A 47-year-old man with an asymptomatic left intraventricular mass was referred to our hospital. Transthoracic echocardiography (TTE) revealed a mass attached to the lateral wall of the left ventricle, with no other structural changes. The true view mode of three-dimensional TEE was more visual, and revealed a regular, very mobile, ball-like mass that was attached to the anterolateral papillary muscle. The mass was then surgical excised. Histopathological analysis indicated that the mass was a myxoma. Cardiac myxomas are commonly seen in the left atrium. Left ventricular myxomas are extremely rare, especially one attached to the papillary muscles.