There are no publications describing hearts at necropsy containing left ventricular assist devices (LVADs). The purpose was to study the relation of the LVAD cannula to the left ventricular (LV) cavity and wall. We studied the hearts at necropsy of 15 adults who had an LVAD inserted from 4 to 1,423 days (median 60) earlier. In 13 patients, the cannula had been inserted at an angle to the major longitudinal axis of the LV chamber, and in 11 patients, the orifice margin of the cannulas contacted the LV mural endocardium. In 3 patients, the LVAD cannula was inserted into the posterior wall, and, in another into the anterior wall. In the remaining 11 patients, the cannula had been inserted into the LV apex. Despite the insertion of the cannulas into the LV apex, the direction of the insertion was not into the longitudinal axis of the LV cavity in 9 patients. These unusual insertions in some patients may have altered flow into the orifice of the cannula; in others, based on their long postoperative survival, physiologic consequences were almost certainly absent. The presence of considerable quantities of subepicardial adipose tissue and pericardial adhesions from previous cardiac procedures (mainly coronary bypass) potentially interfered with achieving proper alignment of the LVAD cannula during its insertion. Misalignment of the cannulas of the LVAD in the LV cavity appears to be rather frequent.