1　甲状腺的 CT解剖简介甲状腺分左、右两叶 ,中间以峡部相连 ,呈蝴蝶形 ,峡部相当于蝶体 ,两叶相当于蝶翼。甲状腺上缘起自甲状软骨下方或中部 ,下缘约平第 6气管环 ,甲状腺峡部居中 ,位于气管正前方 ,左、右两叶分别居气管左、右两侧。正常甲状腺的前后径 (即厚度 ) 2～ 3cm, 1 thyroid CT anatomy Brief introduction Thyroid left and right lobes, the middle of the isthmus connected, was a butterfly, isthmus is equivalent to the butterfly, two leaves equivalent to the wing. Thyroid margin from the thyroid cartilage below or in the middle of the lower edge of about the first 6 tracheal ring, thyroid isthmus center, located in front of the trachea, left and right leaves respectively trachea left and right sides. Normal thyroid anteroposterior diameter (ie, thickness) 2 ~ 3cm,