A decent starter film for a fellowship exam.  A lucent bone lesion.

The examiner can use this film to:

1. assess the candidate's ability to describe a focal bone lesion

2. assess knowledge depth through inquiry into a differential

3. inquire further into additional imaging which may help (e.g. MRI to see fluid-fluid levels to distinguish between a unicameral bone cyst and aneurysmal bone cyst)

4. assess if the candidate gives a common sense/most likely diagnosis and management plan

The reality is on plain film alone it is difficult to be definitive, especially between the chief two differentials of UBC and ABC.