Low-grade intramedullary osteosarcoma of the tibia presenting as an intracortical lesion

Intramedullary or intraosseous osteosarcomas are the most common subtype of osteosarcoma, followed in frequency by parosteal and periosteal osteosarcomas, with intracortical osteosarcomas representing the rarest type. The diagnosis and classification of osteosarcomas can be complicated or delayed when these lesions masquerade as benign bone lesions. This article presents a case of a low-grade osteosarcoma arising in the tibia of a 19-year-old man, which had radiographic features most suggestive of a benign entity.