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TABLE 1: Scheme for the evaluation of cranial MR images in patients with LCH
Anatomic Structure Changes
Craniofacial bones and skull base Bone destruction, tumorous infiltration, intracranial extension
Paranasal sinuses 
 Ethmoidal Bone destruction
 Maxillar Opacification (fluid intense, tissue intense)
 Sphenoidal Enhancement
Intracranial and extra-axial 
 Meninges 
  Epidural With or without bone destruction
  Subdural Infiltration, enhancement, symmetry
 Circumventricular organs^* Enlargement, cystic formation, enhancement, symmetry
  Hypothalamic-pituitary region 
   Anterior pituitary Size (empty sella, atrophy, normal, enlarged), symmetry, enhancement
   Posterior pituitary Size, T1WI hyperintensity present or absent
   Infundibulum Size (measured in at least 2 planes) normal, thickened >2.6 mm, cranial-caudal different, threadlike <1 mm
   Hypothalamus Mass lesions, enhancement
Intracranial and intra-axial, parenchymal 
 WM 
  Vascular pattern Symmetry
  VRSs on T2WI^† Enhancement, space-occupying effect, edema
  Perivascular spaces Visibility on T2WI
  Brainstem, pons Leukoencephalopathy-like pattern
  Cerebellar WM enhancement T2WI hyperintensity, T1WI isointensity or hypointensity, not space-occupying
 GM 
  Basal ganglia T1WI hyperintensity or hypointensity
  Cerebellar dentate nuclei T2WI isointensity, hypointensity, or hyperintensity
Atrophy Localized, diffuse
* Pineal gland, ependyma, choroid plexus.
† VRS indicates Virchow-Robin space.