Trapped ventricle

Trapped ventricle, also known as isolated ventricle, is a condition in which there is obstruction to the entry and exit path of CSF through the ventricle.

The presentation is that of increased intracranial pressure due to expanded trapped ventricle.

  • trapped temporal horn
  • trapped fourth ventricle
    • diplopia
    • ataxia
    • nystagmus

Obstruction of the ventricular outlet (with continued CSF production) results in cystic dilation of the fourth ventricle and supratentorial hydrocephalus 2.

Aetiology
Location

The involved ventricle appears as a focally dilated cystic structure that follows CSF signals on respective cross-sectional imaging. The remaining ventricular system may appear normal.

There is transependymal CSF seepage around the trapped ventricle.

Key hole sign may be seen in cases of herniation of trapped fourth ventricle 1.

Management options include:

  • treatment of the cause
  • shunting of the trapped ventricle
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Article Information

rID: 36477
Section: Pathology
Synonyms or Alternate Spellings:
  • Isolated fourth ventricle
  • Isolated ventricle
  • Trapped ventricles
  • Trapped fourth ventricle

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Cases and Figures

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    Case 1: trapped 4th ventricle
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    There is an isola...
    Case 2
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