AKT-1713
A 27-year-old female comes to the clinic with a nodule in her neck that she has noticed for the past month.
Upon examination, a non-tender, 3.5 cm nodule is found on the right side of her neck, deep to the lower half of the right sternocleidomastoid. The nodule moves upwards on swallowing, and no other masses are palpable in the neck.
What is the nature of this mass?