Traumatic porencephalic cyst of the brain
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Published on: July 5, 2024
D N Yang1, J C Townsend, P F Ilsen
1Optemetry Service, West Los Angeles VA Medical Center, California, USA.
Insights
Porencephalic cysts, fluid-filled brain cavities, can cause visual-field defects after head trauma. These defects may resemble those from strokes or tumors, necessitating careful diagnosis.
Area of Science:
- Neurology
- Ophthalmology
- Radiology
Background:
- Porencephalic cysts are rare cavities in the cerebral hemisphere filled with cerebrospinal fluid.
- They often result from fetal vascular insults or later-life head trauma.
- Associated conditions include visual-field defects, optic nerve hypoplasia, and seizures.
Observation:
- Two cases of porencephalic cysts developing after traumatic head injuries are presented.
- Both patients exhibited visual-field defects.
- Computed tomography scans confirmed the diagnosis of porencephaly.
Findings:
- Visual-field defects caused by porencephalic cysts can mimic symptoms of strokes or brain tumors.
- Porencephaly diagnosis requires thorough neurological evaluation and neuroimaging.
- Differential diagnosis is crucial for appropriate patient management.
Implications:
- Understanding porencephaly's clinical features aids in diagnosing visual-field defects.
- This condition highlights the brain's potential for recovery after trauma.
- Further research into treatment options for porencephaly is warranted.
Background:
A porencephalic cyst is a cavity within the cerebral hemisphere, filled with cerebrospinal fluid, that communicates directly with the ventricular system. It is a rare condition probably caused by vascular occlusion resulting from an insult during fetal development or an injury occurring later in life. 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.
Case Reports:
Two cases are presented of patients in whom porencephalic cysts developed as a result of traumatic head injuries. Both had demonstrable visual-field defects, with diagnosis of porencephaly verified by computed tomography scans of the head.
Conclusions:
Visual-field defects resulting from porencephalic cysts can mimic those observed with strokes or brain tumors. A thorough case history and complete neurologic workup can assist with differential diagnosis. The clinical features of porencephaly, different theories of brain recovery after trauma, and treatment options are discussed.
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