title: Neurodegeneration with Brain Iron Accumulation on MRI: An Adult Case of α-Mannosidosis.
abstract: METHODS
  A 34-year-old woman was referred to our hospital with progressive movement disorders and neurodegeneration with brain iron accumulation and enlargement of the frontal diploe on the MRI. Metabolic testing revealed that she had α-mannosidosis (AMD), a lysosomal storage disorder.
  
  
  BACKGROUND
  AMD is a rare genetic disorder that causes α-mannosidase deficiency resulting in lysosomal accumulation of undigested oligosaccharides. The symptoms of AMD consist of facial and skeletal deformities combined with progressive psychiatric and neurological complaints, especially ataxia and mental retardation. Bilateral patellar dislocation and hearing impairment are frequent.
  
  
  CONCLUSIONS
  The movement disorders we found in our patient have not been reported previously, but they are likely late symptoms of this progressive disorder. The iron deposits in the basal ganglia have also not been reported in AMD and are yet of unknown significance. Lysosomal storage disorders, such as AMD, should be considered in patients with progressive neurologic conditions and neurodegeneration with brain iron accumulation on MRI.
authors: Department of Neurology, Academic Medical Centre, 22660, 1100 DD, Amsterdam, The Netherlands.
authors: Evelien
authors: E
authors: Zoons
authors: Tom J
authors: TJ
authors: de Koning
authors: Nico G G M
authors: NG
authors: Abeling
authors: Marina A J
authors: MA
authors: Tijssen