title: Endodermal cyst in pineal region: Rare location.
abstract: BACKGROUND
  Pineal tumors are very uncommon intracranial lesions, and endodermal cysts in this location are extremely rare.
  
  
  METHODS
  A 49-year-old right-handed female presented with 3 weeks history of progressive dizziness and imbalance. Imaging studies showed 1.8 cm × 1.7 cm × 1.8 cm pineal lesion with small enhancing mural component displacing ventrally the quadrigeminal plate and narrowing of aqueduct of Sylvius without hydrocephalus. In addition, she was found with small interhemispheric lipoma, and small posterior falx possible meningioma. Cerebrospinal fluid markers obtained by lumbar puncture were all negative. She underwent tumor resection, and final pathology reported endodermal cyst. No new deficits were encountered, and her gait imbalance improved significantly by 3 months follow-up.
  
  
  CONCLUSIONS
  With evidence of enlargement or symptomatic pineal lesions, surgical consideration is necessary. Among pineal lesions, endodermal cysts are extremely uncommon and although benign pathology, long-term follow-up is advised due to unknown chronic behavior.
authors.affiliation: Department of Neurosurgery, Arkansas Neurosciences Institute, CHI St Vincent Infirmary, Little Rock, AR 72205, USA.
authors.forename: Miguel Angel
authors.initials: MA
authors.lastname: Lopez-Gonzalez
authors.affiliation: Department of Neurosurgery, Billings Clinic, Billings, MT 59101, USA.
authors.forename: Eugen
authors.initials: E
authors.lastname: Dolan
keywords: Endodermal cyst; pineal region; pineal tumor