Codman's triangle is often associated with which of the following conditions?

Codman's triangle is a radiographic finding that is often associated with aggressive bone lesions, particularly those resulting from osteosarcoma. It appears as a triangular area of bone elevation around the tumor where the periosteum has lifted, indicating periosteal reaction. This is particularly characteristic of osteosarcomas due to their aggressive nature and rapid growth, which leads to the formation of this triangle as the periosteum becomes disrupted.

In terms of Ewing's sarcoma, which is another type of primary bone malignancy, it can also demonstrate similar aggressive behavior. Ewing's sarcoma often presents with a periosteal reaction that may appear as the Codman's triangle. Therefore, while Codman's triangle is most classically associated with osteosarcoma, its appearance can also be seen in cases of Ewing's sarcoma due to its aggressive characteristics.

Considering both conditions can display this specific radiographic feature, the option stating Codman's triangle is associated with both osteosarcoma and Ewing's sarcoma is justifiable. Understanding the association between these tumors and Codman's triangle is essential for recognizing the aggressive nature of primary bone tumors on imaging studies.