1.5 year-old male intact Jack Russell Terrier

History:  Exercise intolerance. Grade III/VI left sided ejection-type systolic murmur. Still Images: Ultrasound clips:   Findings: There is moderate to severe right ventricular hypertrophy with notable hypertrophy of the right ventricular papillary muscles.  There is also flattening of the interventricular septum, indicating that the right ventricular pressure exceeds the left ventricular …

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