“…Of parapharyngeal space metastases from PTC, cystic appearance has been disclosed in seven, including this case, in the literature up until now (Table I). [1][2][3][4][5][6][7][8][9][10] Fine-needle aspiration biopsy prior to surgery is simple and speedy, but cystic metastases in lymph nodes are one of the most common causes of false negatives. 12,13 The differential diagnosis of a cystic lesion arising in the parapharyngeal space should include cystic schwannoma, neurofibroma, necrotic nodal metastases or lymphomas, and cystic hygroma.…”