Author: Michael A. Evans, MD – Ann & Robert H. Lurie Children’s Hospital of Chicago, Northwestern Feinberg School of Medicine


A 5-year-old male child with a history of Mucopolysaccharidosis Type I-H (Hurler Syndrome) presents for an elective MRI. Upon exam, the anesthesiologist auscultates a previously undiagnosed murmur. A preprocedural transthoracic echocardiogram is ordered prior to the MRI. Which lesion is MOST LIKELY to be found on echocardiogram in a patient with Mucopolysaccharidosis Type I-H?