“…However, the differentiation from a neck metastasis of a squamous cell carcinoma of unknown primary is challenging (20). Even though there are strict criteria, the diagnosis of this entity remains controversial (10,14). Also, there is a small percentage of malignancy of these malformations, but it is very important to check whether all the histological diagnostic criteria for a primary branchiogenic carcinoma are accomplished (11,12,13,18).…”