Trapped ventricle

Last revised by Yaïr Glick on 24 Mar 2022

Trapped ventricle, also known as isolated ventricle, is a condition in which there is an 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.

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.

Keyhole 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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