There is a well defined, oval shaped, eccentric, lytic lesion noted in the medial aspect of epi-metaphysis of the distal third of femur. There is narrow zone of transition with no obvious periosteal reaction noted. There is no matrix mineralization. There is cortical thinning with breach noted at the anterior, posterior and medial aspects of the lesion. The lesion appears 2.1mm away from the articular surface. Visualized knee Joint space appears normal.