Spot diagnosis: What does this tetrad of symptoms indicate?

Palpable purpura, abdominal pain, renal involvement and arthritis

James, six years old, presents with a week of fever, and bilateral hip and knee pain, with associated intermittent abdominal pain. What's the spot diagnosis?

Take the quick quiz below, see how you fare against your peers and share your results via social media.

The quiz has no CPD points attached, it's just for fun.