Pathology-MRI Correlations in Diffuse Low-Grade Epilepsy Associated Tumors.

Abstract:

:It is recognized that IDH mutation negative, low-grade epilepsy associated tumors (LEAT) can show diffuse growth patterns and lack the diagnostic hallmarks of either classical dysembryoplastic neuroepithelial tumors (DNT) or typical ganglioglioma. "Nonspecific or diffuse DNT" and more recently "polymorphous low-grade neuroepithelial tumor of the young" have been terms used for these entities. There are few reports on the MRI recognition of these diffuse glioneuronal tumors (dGNT), which is important in planning the extent of surgical resection. In 27 LEATs T1, T2, FLAIR, and postcontrast T1 MRI were evaluated and the pathology reviewed, including immunostaining for NeuN, CD34, MAP2, and IDH1. Each case was then independently classified by pathology or MRI as simple DNT, complex DNT, or dGNT. There was agreement in 23/27 (85%; Kappa score 0.62; p < 0.01). In 4 cases, there was discrepancy in the diagnosis of simple versus complex DNT but 100% agreement achieved for dGNT. DNT showed significantly more expansion of the cortex, cystic change and ventricle extension than dGNT. dGNT showed significantly more subcortical T2w hyperintensity and focal cortical atrophy which correlated on pathology with CD34 expression, cortical neuronal loss and white matter rarefaction. There was no distinct cortical dysplasia component identified by MRI or pathology in any case. This study highlights that dGNT can be reliably discriminated on MRI from DNT.

authors

Al-Hajri A,Al-Mughairi S,Somani A,An S,Liu J,Miserocchi A,McEvoy AW,Yousry T,Hoskote C,Thom M

doi

10.1093/jnen/nlx090

subject

Has Abstract

pub_date

2017-12-01 00:00:00

pages

1023-1033

issue

12

eissn

0022-3069

issn

1554-6578

pii

4484337

journal_volume

76

pub_type

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