患者男性，５４岁，农民，以右颈部肿块９年入院。９年前，患者偶然发现右侧颈部有拇指大小包块，无任何不适，此后包块逐渐增大，近２月来，感呼吸稍有困难。既往病史中无与羊、狗等动物密切接触史。体检：右颈前可触及８ｃｍ×８ｃｍ×５ｃｍ大小肿块，质地硬，表面光滑... Male patient, 54 years old, farmer, admitted to hospital with right neck mass for 9 years. Nine years ago, the patient occasionally found a thumb-sized mass on the right neck with no discomfort, and then the mass gradually increased. In the last two months, the sensation of breathing was slightly more difficult. No past history of sheep and dogs and other animals in close contact with history. Physical examination: the right neck before touching the size of 8cm × 8cm × 5cm mass, texture hard, smooth surface ...