This week end I am attending a spine radiology course. The instructor is Dr. Terry Yochum, the radiologist who authored the two volume textbook, "Essentials of Skeletal Radiology". It is the required radiology text of 40 chiropractic colleges and 100 medical schools. Dr. Yochum, a chiropractic physician, concentrated on presentations of disc disorders, tumors, infections, osteo-arthritis and fractures of the spine. Emphasis was placed in the practical, hands on, viewing of MRI's and CT-scans.