A well-defined, pedunculated bony outgrowth projecting inferiorly and away from the epiphysis in the posterior aspect of the metaphyseal region of the proximal end of the fibula. The cortex and the medullary cavity are continuous with that of the fibula. The cartilage cap is thin and difficult to identify.
There is no periosteal reaction, cortical irregularity, matrix mineralization, or soft tissue component.