Echocardiographic images showing a normal mitral valve (left) and a thickened mitral valve in a patient with mucopolysaccharidosis (MPS) VI (right). Anesthesia and airway management in mucopolysaccharidosis: Walker R, Belani KG, Braunlin EA, Bruce IA, Hack H, Harmatz PR, Jones S, Rowe R, Solanki GA, Valdemarsson B - Journal of inherited metabolic disease (2012). Not altered. CC.