RESUMEN
Dedifferentiated parosteal osteosarcomas are characterized histologically by the combination of low-grade fibroblastic osteosarcoma admixed with a high-grade component that typically has the appearance of malignant fibrous histiocytoma or osteosarcoma. Herein we report a case of dedifferentiated parosteal osteosarcoma of the distal femur, in which the high-grade component consisted of rhabdomyosarcoma. To our knowledge, a rhabdomyosarcomatous component has not been described previously in a dedifferentiated parosteal osteosarcoma. The clinical, radiologic, and pathologic features of this rare type of surface osteosarcoma are described.
Asunto(s)
Neoplasias Óseas/diagnóstico , Fémur , Osteosarcoma/diagnóstico , Complicaciones Neoplásicas del Embarazo/diagnóstico , Rabdomiosarcoma/diagnóstico , Adulto , Neoplasias Óseas/patología , Femenino , Fémur/patología , Humanos , Neoplasias Pulmonares/secundario , Imagen por Resonancia Magnética , Invasividad Neoplásica , Osteosarcoma/patología , Embarazo , Rabdomiosarcoma/patología , Tomografía Computarizada por Rayos XRESUMEN
Metastases to the bones of the foot from prostate carcinomas are rare and usually are associated with diffuse metastatic disease. The authors encountered a patient who presented with prostate carcinoma metastases limited to the right foot. Magnetic resonance imaging correlation in this case demonstrated normal marrow signal in the surrounding bones of the foot and increased vascularity of the foot.