Sutural diastasis

Last revised by Dr Dalia Ibrahim on 15 Jan 2021

Sutural diastasis is an abnormal widening of the skull sutures. It may be physiological in a neonate during a growth spurt. 

In non-traumatic scenarios accelerated growth of the sutural connective tissue without concurrent ossification is the underlying pathology. 

  • widening of the sutures may be appreciated on plain radiograph and is better still appreciated on CT
  • the following widths are considered to be diagnostic of sutural diastasis
    • >10 mm at birth
    • >3 mm at two years
    • >2 mm at three years
  • in cases of trauma, it may be associated with fractures
  • in cases of mass lesions or elevated intracranial pressure, secondary evidence of the same would be demonstrated

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Cases and figures

  • Case 1: due to hydrocephalus
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  • Case 2
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  • Case 3: suture diastasis due to fracture
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  • Case 4
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