The Heart of a Boy with Hypertrophic Cardiomyopathy.

A panoramic histologic view (Panel C) shows coagulation necrosis of the septal myocardium (trichrome-Heidenhain strain). The long intramural course of the left anterior descending coronary artery corresponding to the region of the first and second perforators may explain the infarction of the septum shown in figure 39G. The pictures are consistent with the occurrence of an acute infarction related to coronary artery compression caused by the myocardial bridge.