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Who Regulation

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SYMPOSIUM: The 2007 Revised World Health Organization (WHO) Classification of Tumours of the Central Nervous System: Newly Codified Entities

DOI 10.1111/j.1750-3639.2007.00082.x

Newly Codified Glial Neoplasms of the 2007 WHO Classification of Tumours of the Central Nervous System: Angiocentric Glioma, Pilomyxoid Astrocytoma and Pituicytoma
Daniel J. Brat, MD, PhD1; Bernd W. Scheithauer, MD2; Gregory N. Fuller, MD, PhD3; Tarik Tihan, MD, PhD4 Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, Ga. Department of Pathology and Laboratory Medicine, Mayo Clinic, Rochester, Minn. 3 Department of Pathology, The University of Texas M. D. anderson Cancer Center, Houston, Tex. 4 Department of Pathology, Neuropathology Unit, The University of California at San Francisco, San Francisco, Calif.
2 1

Corresponding author: Tarik Tihan, MD, UCSF, Department of Pathology, Neuropathology Unit, M 551, 505 Parnassus Avenue, San Francisco, CA 94143-0102 (E-mail: tarik.tihan@ucsf.edu)

The 4th edition of the WHO Classification of Tumours of the Nervous System (WHO 2007) introduces changes that reflect both the recognition of new brain tumour types and a better understanding of neoplastic behavior. Three new tumours, angiocentric glioma (AG), pilomyxoid astrocytoma (PMA), and pituicytoma are added to the section on gliomas. AG is a slowly growing cerebral tumour that typically presents with seizures in children and young adults. It is characterized by monomorphous, bipolar tumour cells with a striking perivascular growth pattern. Although the ‘cell of origin’ of AG is not clear, ultrastructural evidence points to an ependymal derivation. Typically, AG can be cured by total resection, and is designated WHO grade I. PMA is a solid, circumscribed tumour occurring mainly in the hypothalamic region of young children. It is composed of a...

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