VPS33A and mucopolysaccharidosis: Unlike patients with the infantile form of mucopolysaccharidosis plus disease due to homozygosity for the p.Arg498Trp mutation in VPS33A, even by early adulthood, the patient P6, who is homozygous for the p.Arg200Pro mutation in the same region of the protein, has not hitherto developed full‐blown systemic complications such as glomerulonephropathy, broncho‐pulmonary complications associated with respiratory distress, or susceptibility to infections or spontaneous hemorrhage.