MFN2 and aceruloplasminemia: The involvement of the cerebellum in CMT2A2 patients, as presented here, may be more frequent than is currently acknowledged, and mutations in MFN2 should be considered among genes possibly associated with not only infantile-onset cerebellar ataxias but also pathologically small sural nerves, which up to now have been reported in spinocerebellar ataxia type 2 and in cerebellar ataxia, neuronopathy, and vestibular areflexia syndrome (CANVAS).