Is this joint pain a sinister sign?
Ella, 23, presents with shoulder pain and tender swelling over the left medial clavicle (pictured), gradually worsening over the past six months.
Each week, How to Treat publishes a clinical picture quiz.
The quiz has no CPD points attached, it's just for fun.
Take the quiz below, see how you fare against your peers and share your results via social media: