Ortho Dx: A bump on the back of the heel

 

A 67-year-old woman presents with left heel pain that has been present for 1 year. The pain seems to come and go but has been quite bothersome for the previous few weeks. She has tried oral anti-inflammatory drugs, ice, and rest, but nothing seems to help. There is no history of seronegative spondyloarthropathy or recent fluoroquinolone ...