Related Experiment Video
Updated: Mar 25, 2026
Endoscopic Approach for Colloid Cyst Resection
Published on: May 23, 2025
Oculomotor Nerve Palsy Complicates Third Ventricle Colloid Cyst Endoscopic Removal: Case Report
Francis Abed Rabbo1, Alexandre Simon2, Douraïed Ben Salem3
1Service de Neurochirurgie, Hôpital Cavale Blanche, CHRU Brest, France; Laboratoire d'Anatomie, Faculté de Médecine, Université de Brest, France; Laboratoire de traitement de l'information médicale, LaTIM UMR1101, France.
Background:
A colloid cyst is a rare benign tumor. If indicated, surgical treatment can be realized using a microsurgical technique or an endoscopic technique. We report an uncommon complication of a third ventricle colloid cyst endoscopic removal.
Case Description:
The cyst was incidentally discovered on computed tomography scan workup for mild head trauma in a 20-year-old male. Minor headache and minor memory loss were noted on clinical examination. Magnetic resonance imaging workup revealed obstructive hydrocephaly of the lateral ventricles associated with left uncal herniation. Surgery was uneventful. However, left oculomotor palsy was noted postoperatively. Workup revealed oculomotor nerve injury and isolated left mammillary body ischemia, secondary to worsened uncal herniation. This worsening might be caused by acute left ventricle hydrocephaly ascribed to interventricular foramen obstruction during cyst removal.
Conclusion:
Therefore, in similar presentation, realizing septum fenestration before cyst removal should relieve the pressure in the lateral ventricles thus decreasing the risk of herniation.
