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Ultrasound of neck (case 1). (A) An isoechoic mass with well demarcated clear border before FNAB (blue arrow); (B) enlargement of a heterogeneous hyperechoic mass mixed with intracapsular hematoma 4 days after FNAB (blue arrow); the patient had developed swelling and neck pain accompanied by odynophagia; (C) 10 days after the FNAB, enlargement of the heterogeneous hyperechoic mass mixed with intracapsular hematoma remained (blue arrow). FNAB, fine needle aspiration biopsy.
