Abstract

Patient KM is a 26-year-old male in whom a systolic ejection murmur was recently identified on a routine physical examination. As part of his evaluation, he underwent 2-dimensional echocardiography, which revealed asymmetrical left ventricular (LV) hypertrophy with a maximum LV wall thickness of 22 mm in the basal anterior septum and extension of hypertrophy into the posterior septum. His LV ejection fraction was 55%, with a normal cavity size and no evidence of resting LV outflow tract obstruction. In addition, the myocardium was noted to be highly trabeculated from the apex to the midportion of the LV (Figure 1; online-only Data Supplement Movie I). The right ventricle was normal in size and function. He has never developed heart failure …

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