Osteosarcoma most commonly arises in which location in adolescents?

Osteosarcoma most commonly arises in which location in adolescents?

• A. Proximal humerus metaphysis
• B. Distal femur metaphysis
• C. Proximal tibia diaphysis
• D. Distal tibia metaphysis

Answer: (B)

The main idea here is where osteosarcoma tends to start in adolescents. This cancer most often originates in the metaphyseal region of long bones near the growth plates, with the knee area being the most affected. During adolescence, bones grow rapidly and osteoblastic activity is high near the physes, creating a setting where malignant transformation of bone-forming cells is more likely to occur. Because of these growth dynamics, the distal femur around the knee is the most common site, followed by the proximal tibia and then other locations. So the distal femur metaphysis fits best with the pattern seen in teens.

The main idea here is where osteosarcoma tends to start in adolescents. This cancer most often originates in the metaphyseal region of long bones near the growth plates, with the knee area being the most affected. During adolescence, bones grow rapidly and osteoblastic activity is high near the physes, creating a setting where malignant transformation of bone-forming cells is more likely to occur. Because of these growth dynamics, the distal femur around the knee is the most common site, followed by the proximal tibia and then other locations. So the distal femur metaphysis fits best with the pattern seen in teens.