Lateral (or distal) erosion of the clavicle has multiple causes which include:

- post traumatic

- myeloma

- hyperparathyroidism

- rheumatoid disease, scleroderma and other spondylarthritides ( as in this case of psoriatic arthritis )

This is a very classic fellowship viva film as:

- Can you spot it?

- Have you heard of it?

- Do you know the potential causes?