Fig. 6
From: Multiple primary tumors: a case report and review of the literature
a Anteroposterior radiograph of the right knee showed a small lytic lesion in the proximal tibia with a diameter of 1 cm. b After five months, the lesion extended, and has a non-sclerotic margin medially (arrowheads). c After six months, the lesion shows typical appearance of GCTB which extends to the subchondral bone that is eccentric in location and extends to the subchondral bone with a sclerotic margin