Objective: The aims of this study were to analyze the maxillomandibular morphology of patients with mucopolysaccharidosis (MPS) type I, II, III, IVa and VI and to evaluate the craniofacial effect of hematopoietic stem cell transplantation (HCST) in MPS I.
Materials And Methods: One hundred head magnetic resonance images were retrospectively analyzed from 41 MPS and 27 control individuals. The width, height and length of the maxilla and mandible were plotted against age and the means of controls, MPS I, MPS II and MPS III were statistically compared. To determine the effect of HSCT in MPS I, jaw morphology was compared between MPS I patients with full donor chimerism versus patients with mixed/no donor chimerism.
Results: Maxillary dimensions were not statistically different between the MPS types. The height and length of the mandible were clearly smaller in MPS I as compared to those in controls, MPS II and MPS III. This was associated with progressive resorption of the mandibular condyles in MPS I, which was also observed in MPS II and VI, but not in MPS III or IVa. Whereas the success of HCST did not affect these changes, mandibular width was significantly smaller in MPS I individuals with full donor chimerism.
Conclusion: MPS I individuals have a smaller mandible as compared to control, MPS II and MPS III individuals due to progressive condylar degeneration. These abnormalities are also evident following successful HSCT.
Clinical Relevance: Clinicians should be aware of specific differences in mandibular morphology and condylar involvement among the MPS subtypes.
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