Which of the following is true for chondrosarcoma?
**Core Concept**
Chondrosarcoma is a malignant tumor originating from cartilage-producing cells, often found in the bones of the extremities, pelvis, or ribs. It is the second most common primary bone malignancy after osteosarcoma.
**Why the Correct Answer is Right**
Chondrosarcomas arise from the malignant transformation of chondrocytes, which are responsible for cartilage synthesis and maintenance. The tumor's growth is characterized by the production of abnormal cartilage, leading to bone destruction and deformity. Chondrosarcomas are typically resistant to chemotherapy and radiation therapy, making surgical excision the primary treatment modality.
**Why Each Wrong Option is Incorrect**
**Option A:** Chondrosarcomas are typically benign, which is incorrect as they are malignant tumors.
**Option B:** Chondrosarcomas are more common than osteosarcomas, which is incorrect as osteosarcomas are more common.
**Option C:** Chondrosarcomas are responsive to chemotherapy, which is incorrect as they are generally resistant to chemotherapy.
**Clinical Pearl / High-Yield Fact**
Chondrosarcomas often present with pain and swelling in the affected bone, and a characteristic "rattling" or "grinding" sensation due to the production of abnormal cartilage.
**Correct Answer: C. They are generally resistant to chemotherapy.**