Which type of tumor is characterized by lobules of hyaline-like cartilage and nests of malignant chondrocyte-like cells?

• A. Enchondroma
• B. Osteosarcoma
• C. Chondrosarcoma
• D. Fibrosarcoma

Answer: (C)

Chondrosarcoma is a malignant tumor characterized by the production of cartilage. It typically presents with lobules of a hyaline-like cartilage matrix interspersed with nests of atypical chondrocyte-like cells that demonstrate features of malignancy, such as increased nuclear-to-cytoplasmic ratios and abnormal mitotic figures. This histopathological appearance is distinct for chondrosarcoma and helps differentiate it from other cartilage-forming tumors.

In contrast, enchondromas are benign cartilage tumors that do not exhibit the same degree of cellular atypia and malignancy as chondrosarcomas; they generally arise in the medullary cavity of bones and are composed of well-differentiated chondrocytes. Osteosarcoma, while also a malignant bone tumor, typically produces osteoid rather than cartilage and has a different histological appearance featuring malignant osteoblasts. Fibrosarcoma is a tumor of mesenchymal origin characterized by fibrous tissue and does not involve cartilage formation, making it distinct from chondrosarcoma.

Thus, the presence of lobules of hyaline-like cartilage and nests of malignant chondrocyte-like cells is a hallmark feature of chondrosarcoma, confirming its