Subdural hygroma

Subdural hygromas refer to a cerebrospinal fluid (CSF) accumulation in the subdural space. In many cases it is considered an epiphenomenon of head injury when it is called a traumatic subdural hygroma

They generally occur along the supratentorial cerebral convexities; occurrence in the posterior fossa is generally rare 4.


Crescentic CSF density/signal accumulation of CSF in subdural space that does not extend into the sulci. Vessels may cross through the lesion in contrast enhanced studies.

Imaging differential considerations include:

  • chronic subdural haematoma: MRI may required to differentiate as they can have an identical appearance on CT
  • atrophy/involutional change with enlargement of the subarachnoid space
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Article Information

rID: 18609
Section: Pathology
Synonyms or Alternate Spellings:
  • Subdural hygromas
  • Subdural hygromata
  • Traumatic subdural hygroma
  • CSF hygromas
  • CSF hygroma

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