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 rarely cross through the lesion in contrast enhanced studies (see cortical vein sign).

Imaging differential considerations include:

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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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Cases and figures

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    Case 2: left frontal convexity
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