Is it goitre or lymphoma?
Tim, 23, presented with a gradually enlarging swelling in the right upper lateral aspect of the neck.
Each week, How to Treat publishes a clinical picture quiz.
The quiz has no CPD points attached, it's just for fun.
Earn CPD points: How to Treat — Neck lumps in adults
Take the quiz below, see how you fare against your peers and share your results via social media: