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Subdural hygroma

A subdural hygroma refers to a cerebrospinal fluid accumulation in the sub-dural space. In many cases it is considered an epiphenomenon of head injury where it is termed a traumatic subdural hygroma. They generally occur along the supratentorial cerebral convexities and occurrence in the posterior fossa is generally rare 4.

Radiographic features

Crescentic CSF density accumulation of CSF in subdural space which does not extend into the sulci. Vessels may cross thorugh the lesion in contrast enhanced studies.

Differential diagnosis

Imaging differential considerations include

  • chronic subdural haematoma
  • atrophy / involutional change with enlargement of the subarachnoid space

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