ABSTRACT
We present a case of osteosarcoma arising in an osteochondroma of the right fibula in a 30-year-old woman. The available radiographic studies of the lesion were not suggestive of malignant transformation. The lesion and underlying bone were excised. Histologic examination showed a conventional high-grade osteoblastic osteosarcoma that focally eroded the fibrocartilaginous cap. The patient received postoperative chemotherapy and shows no evidence of disease 27 months following operation. The occurrence of osteosarcoma in an osteochondroma is an extremely rare event, and only a few cases are on record in the literature.
Subject(s)
Bone Neoplasms/diagnosis , Fibula/pathology , Neoplasms, Multiple Primary/diagnosis , Osteochondroma/diagnosis , Osteosarcoma/diagnosis , Adult , Bone Neoplasms/diagnostic imaging , Bone Neoplasms/pathology , Female , Fibula/diagnostic imaging , Humans , Neoplasms, Multiple Primary/diagnostic imaging , Neoplasms, Multiple Primary/pathology , Osteochondroma/diagnostic imaging , Osteochondroma/pathology , Osteosarcoma/diagnostic imaging , Osteosarcoma/pathology , RadiographyABSTRACT
The appearance of a sarcoma of bone is a well-recognized complication of Paget's disease. The most common type of such a sarcoma is osteosarcoma. Much less common are soft tissue lesions adjoining the pagetic bone that clinically and radiologically simulate sarcoma but histologically represent exaggerated periosteal bone formation as a manifestation of the basic pathologic process. We present a case of a bulky juxtacortical soft tissue mass in the thigh arising from a pagetic femur in a 62-year-old patient with polyostotic Paget's disease that was clinically and radiologically suspected to be a juxtacortical osteosarcoma. Microscopically, the lesion showed features of florid Paget's disease without any evidence of sarcomatous growth. It is important to be aware of this rare manifestation of Paget's disease to avoid unnecessary overtreatment.
