An orthopedic oncology is a diagnoses and treatment of primary benign and malignant tumors of the bones. Knowledge of the musculoskeletal anatomy and pathophysiology of the malignancy is required to effectively and efficiently diagnose and treat common disease entities and injuries. Also, a sound knowledge of effects of systemic neoplastic disease is essential. Upon completion of a rotation on the Oncology Service, the resident must demonstrate knowledge of the etiology of oncologic disease affecting the musculosketal system and be able to formulate a differential diagnosis.