Disclaimer: Online Resource for Education in Neuropathology (OREN) is a free educational program provided by the American Association of Neuropathologists (AANP), Inc.  The content of OREN reflects only the views and opinions of the contributing authors but not that of the AANP nor her members. This site is strictly for educational purposes, not for diagnostic and research purposes. Pathology is an ever changing field. Readers are advised to check the most current information. The AANP, the Editorial Board of AANP-OREN, the sponsoring institution, and the contributors do not assume liability for any injury and/or damage to persons or property arising from the use this online publication.

The opinions or assertions contained herein are the private views of the authors and are not to be construed as official or as reflecting the views of the US Department of the Army or the Department of Defense, the University of Oklahoma Health Sciences Center or the AANP.