Figure 13.

A: Anteroposterior and lateral radiography of the right knee of a female patient with a primary breast tumor. Metaphyseal lytic lesion on the tibia, with an imprecise zone of transition and ill-defined borders (arrows). B: Another case of a female patient with a primary breast tumor, who presented with knee pain. The image shows radiological features of aggressiveness, characterized by lytic lesion on the distal left femur, which breaks through the cortical bone (arrows), invades the adjacent soft parts, without a sclerotic rim and with an imprecise zone of transition. There are also lesions in the medial condyle of the fêmur and proximal third of the tibia.