A 4-year-old boy has a sublingual mass. 99mTc pertechnetate scanning shows significant uptake in this region. Which of the following is the embryologic explanation for this mass?
一名4岁男孩舌下肿块。99mTc高锝酸盐扫描显示该区域有明显的摄取。以下哪一项是对这个肿块的胚胎学解释?
(A) The thymus has developed ectopically胸腺异位发育
(B) The thymus has hypertrophied胸腺肥大
(C) The thyroid has failed to migrate caudally甲状腺未能向尾侧迁移
(D) The thyroid has migrated too far rostrally甲状腺向口侧迁移太远
(E) The third and fourth branchial (pharyngeal) arches have hypertrophied第三和第四鳃(咽-喉)弓肥大
答案解析:
该肿块摄取99mTc高锝酸盐(与碘一样被甲状腺炎捕获)及其位于舌下的位置强烈提示其由异位甲状腺组织构成。正常情况下,甲状腺憩室从原始咽底发育,然后向下进入颈部。附着在舌上的甲状腺组织意味着它没有向尾侧迁移。舌部是异位甲状腺组织最常见的部位。
正确答案:C
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