A comparison of normal cardiac anatomy (A) and the pathology of hypertrophic cardiomyopathy (B). Hypertrophic cardiomyopathy causes cardiomegaly (570 g; normal 270 to 360 g), bi-atrial (right and left) dilation, and marked increases in the interventricular and left ventricular wall thickness. Papillary muscle hypertrophy is notable. Source: Hypertrophic Cardiomyopathy, The Online Metabolic and Molecular Bases of Inherited Disease Citation: Valle D, Beaudet AL, Vogelstein B, Kinzler KW, Antonarakis SE, Ballabio A, Gibson K, Mitchell G. The Online Metabolic and Molecular Bases of Inherited Disease; 2014 Available at: http://ommbid.mhmedical.com/DownloadImage.aspx?image=/data/books/971/ch213fg1.png&sec=62658481&BookID=971&ChapterSecID=62658477&imagename= Accessed: November 10, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved