2019 Volume 3 Issue 2 Pages 23-28
A mosaic color pattern of the left ventricular outflow tract by color Doppler echocardiography can be found in conditions such as dynamic left ventricular outflow tract obstruction due to hypertrophic cardiomyopathy and deformation or hypertrophy of mitral valve leaflets, chordae tendineae, and/or papillary muscles. One condition that can cause dynamic left ventricular outflow tract obstruction is systolic anterior motion (SAM) of the anterior leaflet of the mitral valve. The pathogenesis of SAM is still unknown. We encountered a cat that on initial presentation had a mosaic color pattern without myocardial hypertrophy (a left ventricular wall measuring less than 6 mm thick in diastole). At 299 days, papillary muscle hypertrophy had manifested. Myocardial hypertrophy was confirmed at 359 days. This report documents the clinical history of this cat.