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Although mucolipidosis, a fatal metabolic storage disorder, is associated with cardiovascular abnormalities, detailed, non-invasive cardiac examinations have not been well documented. We studied 4 children with type II and type III mucolipidosis, 3 of whom had unequivocal evidence of aortic regurgitation characterized by phonocardiography and M-mode echocardiography. Two-dimensional echocardiography showed an aortic valve prolapse in 3, a mitral valve prolapse in 2 and a tricuspid valve prolapse in 1. The QT interval was prolonged in 2 cases. In 1 autopsy case, we found considerably thickened and retracted aortic, mitral, and tricuspid valves, and accumulation of the foam cells in the myocardium. Echocardiography revealed similar findings in another 3 cases. We conclude that cardiac manifestations in this disorder should be examined carefully particularly by the use of echocardiography which is an excellent technique for detecting cardiovascular abnormalities in mucolipidosis.

Cardiac involvement in mucolipidosis. Importance of Non-invasive studies for detection of cardiac abnormalities.