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Dyke-Davidoff-Masson syndrome

Dyke-Davidoff-Masson syndrome (DDMS) was initially described as changes in the skull seen on skull X-ray in patients with cerebral hemiatrophy, but is now applied more broadly to cross-sectional imaging also. It is characterised by :

  • thickening of the skull vault (compensatory)
  • enlargement of the frontal sinus (also ethmoidal and mastoid air-cells)
  • elevation of the petrous ridge
  • ipsilateral falcine displacement
  • Capillary malformations(are a novel finding for children with Dyke-Davidoff-Masson syndrome)6

In some sources it is equated to hemispheric infarction, whereas in other sources any cause of cerebral hemiatrophy are included.

Clinical presentation

  • seizures
  • facial asymmetry
  • contralateral hemiparesis
  • mental retardation7


It was initially described by C.G Dyke , L.M Davidoff and C.B Masson in 1933 5

Differential diagnosis

General imaging differential considerations include

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