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Indian Journal of Pathology and Microbiology
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REVIEW ARTICLE
Year : 2022  |  Volume : 65  |  Issue : 5  |  Page : 68-72

Overview of recent advances in the classification of ependymomas in WHO CNS5 classification: Simplified approach to their integrated diagnosis


1 Department of Pathology and Laboratory Medicine, All India Institute of Medical Sciences, Raipur, Chhattisgarh, India
2 Department of Pathology, Neuropathology Division, All India Institute of Medical Sciences, New Delhi, India

Correspondence Address:
Mehar C Sharma
Professor, Department of Pathology, Neuropathology Division, All India Institute of Medical Sciences, New Delhi – 110 029
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijpm.ijpm_1212_21

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Ependymomas can arise along the entire neuraxis; however, they possess site-specific unique molecular alterations and a methylome pattern which is directly related with the prognostic outcomes. Since 2016, when the updated fourth edition of World Health Organization (WHO) classification of tumors of the central nervous system was published, it has been emphasized to classify ependymomas by anatomic site and molecular signatures associated genetic alterations so that classification of the disease reflects its underlying biology. In continuation, the fifth edition of the WHO classification of CNS tumors introduces major changes, including site-specific molecular profiles as the basis of classifying ependymomas. Furthermore, an integrated tier system of reporting is recommended for better clinical correlation and predicting outcomes. WHO grading can still be included in a specific tier, along with molecular markers.


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