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Primary diffuse leptomeningeal glioneuronal tumors

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Abstract

Diffuse leptomeningeal disseminated glioneuronal tumor (DL-GNT) is a rare brain tumor that presents as a plaque-like subarachnoid tumor, commonly involving the basal cisterns and interhemispheric fissure of children but lacking intraparenchymal tumor. Histologically, the tumors are composed of sheets of monotonous rounded cells. Here, we report three cases of DL-GNTs, focusing on clinicopathologic features. Two patients were adult male, but one patient was child. The patients presented with seizures (n = 1) or headaches (n = 2). In all patients, radiography revealed characteristic leptomeningeal thickening and enhancement with minor superficial parenchymal lesions. All three cases were diffusely positive for both GFAP and synaptophysin, and scattered positive for OLIG2 and NeuN, but negative for IDH-1 (H09). Electron microscopic examination showed astrocytic and neuronal differentiation. The patient with the anaplastic tumor died due to aggressive progression of the tumor, but the remaining two patients were stable without tumor recurrence for 23 and 37 months. Thus, these findings suggest that DL-GNT can occur in both children and adult and both supra- and infra-tentorial leptomeninges. It has unique radiological and histopathological features and biological behavior. Further clinicopathological data with molecular genetic study are required for establishing DL-GNT as a unique entity.

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Acknowledgments

This study was supported by a grant (A112005) of the Korean Health Technology R&D Project, Ministry of Health and Welfare, Republic of Korea and National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2010-0028631).

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There is no conflict of interest to declare.

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Correspondence to Sung-Hye Park.

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Cho, H.J., Myung, J.K., Kim, H. et al. Primary diffuse leptomeningeal glioneuronal tumors. Brain Tumor Pathol 32, 49–55 (2015). https://doi.org/10.1007/s10014-014-0187-z

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  • DOI: https://doi.org/10.1007/s10014-014-0187-z

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