Intracortical osteosarcoma is the rarest form of osteosarcoma. The lesion is histologically characterized as a sclerosing variant of osteosarcoma. In this study, a new case of pathologically proven tibia intracortical osteosarcoma in a 14-year-old girl is presented. Imaging findings on computed tomography and magnetic resonance imaging are discussed. The role of computed tomography-guided biopsy is emphasized.