A 45-year-old woman noticed a lump in the right side of her neck 3 months ago. At first it was small, and she thought it was ‘just a swollen gland’. However, she had a mild throat infection a month ago and the lump, although still quite painless, got larger. Now she was getting concerned.
She consulted her own doctor, who referred her to the surgical outpatients clinic. On examination, the lump was smooth, round and not attached to the overlying skin. Its anterior part emerged from under the anterior border of sternocleidomastoid. It fluctuated and transilluminated brilliantly to torchlight.
What is the likely diagnosis ?
