title: Hyperdense intracranial epidermoid cysts: a study of 15 cases.
abstract: BACKGROUND
  Although intracranial epidermoid cysts generally appear as hypodense lesions on CT scans, occasionally, they may appear hyperdense, making diagnosis difficult. The aim was to study clinical features and possible pathogenesis of hyperdense intracranial epidermoid cysts (HIECs).
  
  
  METHODS
  Fifteen patients with HIECs were surgically treated in our department during a 21-year period (1985 up to 2005). We reviewed each patient's clinical records, radiological findings, operative reports, and pathological examinations, along with a review of the literature.
  
  
  RESULTS
  The incidence of HIECs in our series was approximately 3.02%, with female predominance. The average age was 32 years and the average duration of complaints was nine months. The most common location was the parasellar area (6 cases), followed by cerebellum (4 cases), clival region (3 cases), cerebello-pontine angle (1 case) and lateral ventricle (1 case). Gross-total excision of the tumor was achieved in ten patients (66.7%). Four (26.7%) patients underwent subtotal resection; and one (6.6%) patient underwent partial resection. Aseptic meningitis that occurred postoperatively in two cases was controlled by lumbar drainage.
  
  
  CONCLUSIONS
  Recurrent leakage of the irritating cyst contents and subsequent chemical inflammatory response may be responsible for the high-density on CT scans and the cystic nature. A correct histological diagnosis is important because, in contrast to typical ECs and other lesions, HIECs are more prone to spread intra-operatively and result in severe aseptic meningitis.
authors.affiliation: Department of Neurosurgery, Qilu Hospital of Shandong University, Jinan, P.R. China.
authors.forename: F
authors.initials: F
authors.lastname: Li
authors.forename: S
authors.initials: S
authors.lastname: Zhu
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.forename: G
authors.initials: G
authors.lastname: Chen
authors.forename: L
authors.initials: L
authors.lastname: Chi
authors.forename: F
authors.initials: F
authors.lastname: Qu
mesh_terms: D000293:Adolescent; D000328:Adult; D001927:Brain Diseases / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D003937:Diagnosis, Differential; D004814:Epidermal Cyst / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome