We describe a case of a 54-year-old man who presented with a pathologic hip fracture secondary to a right femur tumor. A reaming biopsy showed the diagnosis of dedifferentiated chondrosarcoma. In addition, the patient had a thyroid mass. Fine needle aspirate from the thyroid mass revealed numerous large fragments of cohesive spindle cells with moderate nuclear atypia and brisk mitosis, identical to the femur tumor. Immunohistochemical staining on cell block of thyroid aspirate showed positivity for mesenchymal markers and negativity for to epithelial and thyroid markers. The metastasis of dedifferentiated chondrosarcoma to thyroid gland is a very rare incident and was described once in the literature. In this report, we describe the clinical and pathologic findings of this case.

We describe a case of a 54-year-old man who presented with a pathologic hip fracture secondary to a right femur tumor. A reaming biopsy showed the diagnosis of dedifferentiated chondrosarcoma. In addition, the patient had a thyroid mass. Fine needle aspirate from the thyroid mass revealed numerous l...