[Dysembryoplastic neuroepithelial tumor: a clinicopathologic and immunohistochemical study].
OBJECTIVE
To study the clinicopathologic features, immunophenotype and histogenesis of dysembryoplastic neuroepithelial tumor (DNT).


METHODS
Fourteen cases of DNT were retrieved from the archival files of the Department. The histopathologic features and immunohistochemical findings were retrospectively studied. The long-term follow-up data were analyzed.


RESULTS
Eleven of the 14 cases studied were located in the temporal lobe. Histologically, the tumor consisted of a heterogeneous admixture of neuronal and glial cells (including 1 simple form case, 8 complex form cases and 5 non-specific form cases). The specific glioneuronal element was seen in 9 cases. Variable degrees of cortical dysplasia (CD) were found in 10 out of the 11 cases which had sufficient tissue samples for thorough histologic examination. The morphologic appearance of CD included the presence of heterotopic neurons in molecular layer and/or white matter (7 cases), persistent subpial granular cell layer (4 cases), dyslamination (10 cases) and cellular abnormalities. Immunohistochemically, the oligodendroglial-like cells expressed Olig2. Some of which were positive for nestin, MAP-2, neurofilament and glial fibrillary acidic protein, but negative for NeuN. Long-term follow up revealed that 12 patients had class I postoperative seizure and 2 patients had class II seizure. No tumor recurrence was detected.


CONCLUSIONS
DNT is frequently associated with CD. The morphologic diagnosis can be confirmed by immunohistochemical study using a panel of antibodies.
Chen
Li
L
Department of Pathology and Functional Neurosurgery, Xuanwu Hospital of Capital University of Medical Sciences, Beijing 100053, China.
Xu
Qing-zhong
QZ
Piao
Yue-shan
YS
Zhang
Guo-jun
GJ
Yu
Tao
T
Yang
Xiao-ping
XP
Yang
Hong
H
Lu
De-hong
DH
D000293:Adolescent; D000328:Adult; D000927:Anticonvulsants / Q000627:therapeutic use; D051792:Basic Helix-Loop-Helix Proteins / Q000378:metabolism*; D001932:Brain Neoplasms / Q000150:complications / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D002648:Child; D002675:Child, Preschool; D004827:Epilepsy / Q000188:drug therapy / Q000209:etiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007381:Intermediate Filament Proteins / Q000378:metabolism; D008297:Male; D054220:Malformations of Cortical Development / Q000150:complications / Q000473:pathology*; D008869:Microtubule-Associated Proteins / Q000378:metabolism; D018302:Neoplasms, Neuroepithelial / Q000150:complications / Q000378:metabolism / Q000473:pathology* / Q000601:surgery; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D064231:Nestin; D000076104:Oligodendrocyte Transcription Factor 2; D009836:Oligodendroglia / Q000473:pathology; D012189:Retrospective Studies; D055815:Young Adult
D000927:Anticonvulsants; D051792:Basic Helix-Loop-Helix Proteins; D007381:Intermediate Filament Proteins; D008869:Microtubule-Associated Proteins; D009419:Nerve Tissue Proteins; D064231:Nestin; D000076104:Oligodendrocyte Transcription Factor 2; C489788:MAP2 protein, human; C577484:NES protein, human; C405708:OLIG2 protein, human