Cross section of the heart at mid-left ventricular (LV) cavity level from a 21-year-old patient with HCM showing the site from which tissue blocks were taken from ventricular septum (VS) for histologic examination (inside broken line). Note that the VS is inappropriately hypertrophied (enlarged). RV= right ventricle.
Shirani, J., MD, Pick, R., MD, Roberts, W.C., MD, Maron, B.J., MD, Morphology and Significance of the Left Ventricular Collagen Network in Young Patients With Hypertrophic Cardiomyopathy and Sudden Cardiac Death, Journal of American College of Cardiology, Vol 35, No 1, 2000, p 37. (modified)