POSTER SESSION VI Wednesday, March 26, 2003   —  1:00 - 4:00 PM Exhibit Hall A - C ULTRASTRUCTURAL PATHOLOGY 200 Computer Assisted Three-Dimensional Reconstruction and Visualization of the Birbeck Granule (1506) PM Arnell, MK Selig, GP Nielsen, UJ Balis Massachusetts General Hospital, Boston, MA 201 An Immunohistochemical and Ultrastructural Comparative Study of External Lamina (EL) Structure in 31 Cases of Cellular, Classical, and Melanotic Schwannomas (1511) H-Y Huang, RA Erlandson, N Park, CR Antonescu Memorial Sloan-Kettering Cancer Center, New York, NY; Chang Gung Memorial Hospital, Kaoshiung, Taiwan; Columbia University, New York, NY 202 Differential CD68 Expression in Chromophylic Renal Cell Carcinoma and Clear Cell Renal Cell Carcinoma: An Immunohistochemical and Ultrastructural Study (1508) E Diaz, J Lloreta, L Ferrer, T Baro, O Bielsa, A Gelabert, S Boluda, L Pijuan, L Magan, M Jimeno, JM Corominas, S Serrano Hospital del Mar-IMAS-IMIM, Universitat Pompeu Fabra, Barcelona, Spain; Autonomous University of Barcelona, Barcelona, Spain 203 Epstein-Barr Virus-Associated Leiomyomatous Tumors in Immune Compromised and Immune Suppressed Children: Histopathologic and Ultrastructural Features (1509) J Hicks, J Barrish, R Nichols, S-H Zhu Texas Children's Hospital, Baylor College of Medicine, Houston, TX 204 Ultrastructural Spectrum of Gastrointestinal Autonomous Nerve Tumors (GANT) (1513) K-W Min, IS Seo Deaconess Hospital, Oklahoma City, OK; Indiana University, Indianapolis, IN 205 Light Microscopy, Electron Microscopy and Mitochondrial Enzyme Function in Muscle Biopsies for Suspected Mitochondrial Cytopathies (1514) SE Rollins, GP Nielsen, ET Hedley-Whyte Massachusetts General Hospital, Harvard Medical School, Boston, MA 206 Detrusor Muscle (DM) Biopsy in Patients with Urinary Voiding Dysfunctions, Is There a Role for Electron Microscopy?(EM) (1512) B Krishnan, HH Lai, V Narain, T Boone Veterans Affairs Medical Center and Baylor College of Medicine, Houston, TX; Baylor College of Medicine, Houston, TX; Wayne State University, Detroit, MI