患者 ,女 ,2 8岁。发现颈上正中部无痛性肿块 2个月余 ,无声嘶及咽喉部疼痛。检查 :颈上正中部相当舌骨水平扪及 1 .5cm× 1 .5cm大小肿块 ,质地略硬 ,表面有凹凸感 ,边界清 ,可活动 ,随吞咽上下活动 ,双甲状腺无肿大。B超示 :双甲状腺形态大小正常 ,颈正中部相当舌骨水平见一 Patient, female, 28 years old. It was found that the painless mass in the middle of the neck was more than 2 months old, and there was no sound or pain in the throat. Examination: the middle of the neck is quite hyoid bone level and l.5cm x 1.5cm lump size, texture is slightly hard, the surface has a sense of concavity and convexity, the border is clear, can be active, with the activities of swallowing up and down, the double thyroid gland is not swollen. B ultrasound shows: the size of the two thyroid glands is normal, and the middle of the neck is very similar to the level of the hyoid bone.