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Subdivision of the left ventricle by a discrete ridge and anomalous papillary muscle causing mid‐ventricular obstruction: A case report

A 16‐year‐old healthy boy visited our department because of a heart murmur. A 12‐lead electrocardiogram showed left QRS axis deviation and repolarization abnormalities. Transthoracic echocardiography and a computed tomographic scan revealed a hypertrophied papillary muscle and a discrete ridge arising from the septal wall, causing mid‐ventricular obstruction. Doppler echocardiography revealed that the pressure gradient at the obstruction was mild. The patient will be followed up annually, without medication or physical restriction.