An unusual source of ankle pain

This is a case I will never forget from residency. Check it out (warning, graphic pictures!)

This patient was complaining of ankle pain for quite some time and was recently getting worse. She denied any trauma.

This patient was complaining of ankle pain for quite some time and was recently getting worse. She denied any trauma.

X-rays were taken and it looks like there is a halo or ring around the ankle

X-rays were taken and it looks like there is a halo or ring around the ankle

What is that?

Can you guess what was removed?

Can you guess what was removed?

The patient was taken to surgery to remove this foreign body, it was a rubberband that she had used to tie up her pant leg but must have forgotten it was there at some point. Doesn't it just hurt to look at it? 

The patient was taken to surgery to remove this foreign body, it was a rubberband that she had used to tie up her pant leg but must have forgotten it was there at some point. Doesn't it just hurt to look at it?