Morphology quiz: a 12-year-old child with a tumour in the neck

A 12-year-old male patient came to our clinic with a growing neck mass on the right side. A painless mass was observed in the right neck area below the chin in the physical examination. A single, hypoechoic, solid lesion of approximately 3 cm in size, adjacent to the mandibular area, was detected using ultrasonography. An ultrasound-guided fine-needle aspiration biopsy was performed.