A 26-year-old man with severe right ventricular hypertrophy

Question The aetiology of his cMRI findings is most likely: Pulmonary hypertension from chronic left-to-right shunting. Infundibular obstruction from anterior deviation of the conal septum. Subinfundibular obstruction from hypertrophied muscle bundles. Infiltrative cardiomyopathy with deposition of abnormal fibrils.