title: Surgery for epilepsy in children with dysembryoplastic neuroepithelial tumor: clinical spectrum, seizure outcome, neuroradiology, and pathology.
abstract: BACKGROUND
  Dysembryoplastic neuroepithelial tumors (DNTs) were first described by Daumas-Duport et al. in 1988 as a typically cortical tumor affecting young patients with long-standing, drug-resistant epilepsy.
  
  
  METHODS
  We reviewed the medical records of 29 patients with DNT between 1994 and 2007 at Hacettepe University Children's Hospital retrospectively; age at the time of surgery, age at seizure onset, electroencephalography (EEG), MRI, medical treatment, surgical procedure, seizure outcome, and pathological findings were documented.
  
  
  RESULTS
  Male to female ratio was 15/14. Age at the time of evaluation ranged 4-24 years. Twenty-seven patients (93.1%) had complex partial seizures, one (3.44%) had simple partial seizures, and one patient had generalized seizures. Preop interictal EEG showed epileptiform discharges in 24 patients, while in five patients interictal EEG before surgery showed no epileptiform discharges. Pathologically, 24 of our patients were classified as complex type and five as simple type. MRI showed temporal lesion in 20 (68.9%) patients and nine patients had extratemporal DNT. We choose the type of surgery according to lesion and the epileptojenic zone. Finally, 27 patients had Engel Class IA and two patients had Engel Class IB outcome.
  
  
  CONCLUSIONS
  Complete resection of the lesion with epileptojenic zone is important for seizure-free outcome. Timing of surgery, extent of surgery, and stopping antiepileptic drugs are still important factors.
authors.affiliation: Department of Neurosurgery, Hacettepe University School of Medicine, 06100, Ankara, Turkey. burcak@tr.net
authors.forename: Burçak
authors.initials: B
authors.lastname: Bilginer
authors.forename: Dilek
authors.initials: D
authors.lastname: Yalnizoglu
authors.forename: Figen
authors.initials: F
authors.lastname: Soylemezoglu
authors.forename: Guzide
authors.initials: G
authors.lastname: Turanli
authors.forename: Ayşenur
authors.initials: A
authors.lastname: Cila
authors.forename: Meral
authors.initials: M
authors.lastname: Topçu
authors.forename: Nejat
authors.initials: N
authors.lastname: Akalan
mesh_terms: D000293:Adolescent; D017668:Age of Onset; D000927:Anticonvulsants / Q000627:therapeutic use; D001921:Brain / Q000473:pathology / Q000503:physiopathology / Q000601:surgery; D001932:Brain Neoplasms / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D002648:Child; D002675:Child, Preschool; D004569:Electroencephalography; D004827:Epilepsy / Q000188:drug therapy / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D018302:Neoplasms, Neuroepithelial / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D012189:Retrospective Studies; D013724:Teratoma / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D000927:Anticonvulsants