- True statement/s about Mesenchymal Chondrosarcoma (another rare type of chondrosarcoma)
a. Occurs at a younger age (third and fourth decade)
b. Much more cellular malignant matrix than a normal chondrosarcoma
c. Some predilection for ribs and mandible noted
d. Indistinguishable from a central chondrosarcoma and often shows characteristic chondroid calcification
e. Local recurrence and disseminated metastases occur late and less frequently than with conventional chondrosarcoma
ANS:
11. e is the only wrong statement. Mesenchymal Chondrosarcoma which almost radiologically appears similar to the typical central chondrosarcoma has a cellular matrix which is more malignant than the typical central chondrosarcoma and so the metastases happen more early and more commonly when compared to the typical variety.
- True statement about Clear-cell Chondrosarcoma (another rare type of Chondrosarcoma)
a. 2% of all chondrosarcomas
b. It is a high grade type of Chondrosarcoma
c. Patient has a long history and a better prognosis
d. Radiographically resembles Chondroblastoma and Chondromyxoid fibroma
e. Involves the ends of long bones, especially the proximal ends of femur or humerus after closure of the growth plate
f. Lesion is usually lytic and may present a loculated or soap-bubble appearance
ANS:
- b is the only wrong statement. The clear cell chondrosarcoma is a low grade tumor and that is the reason for the long history and better prognosis.