Clinical presentation:
Follow up view after a previous fracture in a 16 year old male.

The skeleton is immature. The fibular lesion is cyst-like with a well defined endosteal margin. It expands the bone, but does not breach the cortex. The long axis of the lesion is parallel to the diaphysis. The lesion appears to have migrated down the diaphysis.

There are incidental linear densities that cross the metaphysis of the tibia. These are typical of "growth lines" that indicate the width of the metaphyseal transition zone below the epiphysis at the time when temporary immobility forced a change in the process of normal bone growth. The combination of their near metaphyseal location and the fact that they don't always reach the cortex of the (older) bone, suggests growth lines, as in the lateral view of the tibia.

There is no example of Adamantinoma.
Metastasis is uncommon at this age.