POSTER SESSION I Monday, February 28, 2005   —  9:30 AM - 12:00 Noon Convention Center, Exhibit Hall B BONE & SOFT TISSUE PATHOLOGY 14 Deep-Seated Plexiform Schwannomas (PS). A Pathologic Study of 16 Cases and Comparative Analysis with the Superficial Variety (31) NP Agaram, S Prakash, CR Antonescu - Memorial Sloan-Kettering Cancer Center, New York, NY 15 A Simple and Reliable Method for the Molecular Diagnosis of Fibrous Dysplasia (32) M Al-Adnani, B Idowu, L Yu, TC Diss, RE Gale, E O'Dell, AM Flanagan - University College London, London, United Kingdom; King's College London, London, United Kingdom 16 The Utility of Novel Fluorescence In-Situ Hybridization (FISH) Probes in the Diagnosis of Myxoid Soft Tissue Neoplasms (45) E Downs-Kelly, RM Patel, JR Goldblum, SW Weiss, AL Folpe, RR Tubbs, DG Hicks, M Skacel - Cleveland Clinic Foundation, Cleveland, OH; Emory University, Atlanta, GA 17 Utility of CD117 Immunoreactivity in Differentiating Metastatic Melanoma from Clear Cell Sarcoma (51) J Garcia, MJ Kramer, Z Mackey, R O'Donnell, AE Horvai - University of California, San Francisco 18 Plexiform Fibrohistiocytic Tumor - A Clinicopathologic Study of (38) Cases 60 MZ Knight, ED Remstein, AG Nascimento - Mayo Clinic, Rochester, MN 19 Primary Versus Radiation-Associated Craniofacial Osteosarcoma: Biologic and Clinicopathologic Comparison (66) JB McHugh, DG Thomas, JM Herman, VA Adsay, R Rabah, LH Baker, DR Lucas - University of Michigan, Ann Arbor, MI; Wayne State University, Detroit, MI 20 Heterotopic Mesenteric Ossification: A Distinctive Intraabdominal Pseudotumor Simulating Extraskeletal Osteosarcoma (75) RM Patel, AL Folpe, SW Weiss - Emory University, Atlanta, GA