Mucolipidosis type IV (ML IV) is a lysosomal storage disease characterised clinically by psychomotor retardation and visual abnormalities including corneal clouding, retinal degeneration, or strabismus.
An abnormal configuration of the lower lip such that it is turned outward i.e., everted, with the Inner aspect of the lower lip vermilion (normally opposing the teeth) being visible in a frontal view.
