POSTER SESSION V Wednesday, February 15, 2006   —  9:30 AM - 12:00 Noon Exhibit Level ULTRASTRUCTURAL 208 Endolymphatic Sac Tumorigenesis; Ultrastructural Characteristics (1587) CR Riley, A Vortmeyer, EH Oldfield, R Lonser, B Salah, M Abu-Asab, M Tsokos - NCI/NIH, Bethesda, MD; NCI/NIH, Bethesda, MD 209 Rothmund-Thomson Syndrome in Pediatric Osteosarcoma: Clinicopathologic Features (1580) J Hicks, S Plon, L Wang - Texas Children's Hospital & Baylor College of Medicine, Houston, TX 210 Comparative Ultrastructural Analysis and KIT/PDGFRA Genotype in 125 GastroIntestinal Stromal Tumors (GIST) (1574) NP Agaram, A Baren, L Sarran, K Arkun, RP DeMatteo, P Besmer, CR Antonescu - Memorial Sloan-Kettering Cancer Center, New York, NY 211 Gastrointestinal Stromal Tumors(GISTs):An Immunohistochemical And Ultrastructural Study On 17 Cases (1583) A Liu, M Hosone, S Maeda, Z Naito, Y Sugisaki - Nippon Medical School, Tokyo, Japan 212 Extraosseous Ewings Sarcoma of the Tongue Initially Mistaken for Lymphoblastic Lymphoma: Avoiding Diagnostic Pitfalls (1585) C Montalvo, D Lopez-Terrada, D Mahoney, L Trautwein, J Hicks - Texas Children's Hospital & Baylor College of Medicine, Houston, TX 213 Rhabdomyoma-Like Rhabdomyosarcoma In A PTCHM Heterozygote Murine Model (1581) J Hicks, M Debortoli, J Su, C Mann, J Kim - Texas Children's Hospital & Baylor College of Medicine, Houston, TX 214 Progressive Increase In Basal Cell Caveolae Throughout The Stages Of Induced Canine Prostatic Hyperplasia (1578) F Gallardo-Arrieta, T Mogas, L Magan, F García, A Quintero-Moreno, C Machín, S Serrano, J Reventós, J Lloreta - Veterinary School, UAB, Bellaterra; Hospital del Mar-IMAS UPF/UAB; University Hospital Vall Hebron-UAB, Barcelona, Spain; Universidad de Zulia, Maracaibo, Venezuela 215 Ultrastructural Changes In Prostatic Hyperplasia: A Comparative Study Of Human And Experimentally Induced Canine Disease (1582) N Juanpere, F Gallardo-Arrieta, L Magan, F Garcia, A Quintero-Moreno, C Machin, M Abal, J Morote, S Serrano, J Reventos, T Mogas, J Lloreta - Hospital del Mar-IMAS, IMIM, UPF/UAB, Barcelona; Facultat de Veterinaria, UAB, Bellaterra; Hospital Universitari Vall d'Hebron, UAB, Barcelona, Spain; Universidad de Zulia, Maracaibo, Venezuela 216 Giant Platelets And Absent Response To Ristocetin On Platelet Aggregation Assay: The Need For Electron Microscopy (1586) R Redman, NS Harris, WL Clapp - University of Florida, Malcolm Randall VA Medical Center, Gainesville, FL 217 Response of Proliferative Class IV Lupus Nephritis Following Cyclophosphamide Therapy in Children and Adolescents: Clinicopathologic Study (1576) K Eldin, D Askenazi, A Kale, S Goldstein, R Sheth, D Feig, E Brewer, E Elenberg, J Hicks - Texas Children's Hospital, Houston, TX 218 An Ultrastrucutral Morphometric Analysis Of Laryngeal Epithelium In Laryngopharyngeal Reflux (1577) A Franchi, O Gallo, S Brogelli, E De Campora, D Massi, M Santucci - University of Florence, Florence, Italy; University of Florence, Florence, Italy