MONDO_0009650 (mucolipidosis type II) can be described as follows. Mucolipidosis II (MLII) is a slowly progressive lysosomal disorder characterized by growth retardation, skeletal abnormalities, facial dysmorphism, stiff skin, developmental delay and cardiomegaly. Also known as: I Cell Disease, I-cell disease, N-acetylglucosamine 1-phosphotransferase deficiency, mucolipidosis II, mucolipidosis type II alpha/beta.