患者，女，24岁。无意发现右侧颈部无病性逐渐增大包块4个月余人院。检查：一般情况可，右侧颈部胸锁乳突肌前缘上分见一约4．5cmX3．0cm椭圆形包块，质地中等，活动，无压痛及其他不适，不影响呼吸和吞咽。后鼻孔镜见双侧咽鼓管咽口清晰，圆枕光滑，咽隐窝粘膜色泽正常，甲状? Patient, female, 24 years old. No intention to find the right side of the neck disease-free gradually increased mass 4 months after the hospital. Examination: In normal condition, an approximately 4.5cmX3.0cm elliptical mass is seen on the anterior edge of the sternocleidomastoid muscle of the right neck. The texture is medium, and activity, no tenderness and other discomfort, does not affect breathing and swallowing. The posterior nostril mirror shows clear pharyngeal orifices of the bilateral eustachian tubes, smooth round pillows, and normal pharyngeal crypt recesses and thyroid coloration.