Porencephalic cyst

What it means

A cavity within the cerebral hemisphere, filled with cerebrospinal fluid, that communicates directly with the ventricular system.

Porencephaly is usually the result of damage from stroke or infection after birth, but may also be the result of a developmental defect. Porencephaly is often associated with various ophthalmic and neurologic signs, including visual-field defects, abnormal pupillary responses, optic nerve hypoplasia, decreased vision, nystagmus, strabismus, hemi-inattention, seizures, and mental deficiencies.

Rare diseases that can present with this8

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category