title: Oculomotor Nerve Palsy Complicates Third Ventricle Colloid Cyst Endoscopic Removal: Case Report.
abstract: 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.
  
  
  METHODS
  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.
  
  
  CONCLUSIONS
  Therefore, in similar presentation, realizing septum fenestration before cyst removal should relieve the pressure in the lateral ventricles thus decreasing the risk of herniation.
authors.affiliation: Service 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. Electronic address: francis.ar@gmail.com.
authors.forename: Francis
authors.initials: F
authors.lastname: Abed Rabbo
authors.affiliation: Service de Neurochirurgie, Hôpital Cavale Blanche, CHRU Brest, France.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Simon
authors.affiliation: Laboratoire de traitement de l'information médicale, LaTIM UMR1101, France; Service de Radiologie, Hôpital Cavale Blanche, CHRU Brest, France.
authors.forename: Douraïed
authors.initials: D
authors.lastname: Ben Salem
authors.affiliation: Service 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.
authors.forename: Romuald
authors.initials: R
authors.lastname: Seizeur
mesh_terms: D000328:Adult; D056364:Colloid Cysts / Q000150:complications / Q000473:pathology* / Q000601:surgery*; D006801:Humans; D008297:Male; D044583:Neuroendoscopy / Q000009:adverse effects*; D015840:Oculomotor Nerve Diseases / Q000209:etiology* / Q000473:pathology / Q000517:prevention & control*; D016896:Treatment Outcome
keywords: Colloid cyst; Endoscopy; Mammillary body and complication; Oculomotor nerve; Third ventricle; Uncal herniation