Carpenter G R, Emery J L
J Anat. 1976 Sep;122(Pt 1):77-89.
A survey of the thyroids of 350 infants and children suggests that the presence of thymus and parathyroid tissue within the thyroid is so common as to be classified as normal. One in a hundred thyroids contains masses of cartilage, and one in a hundred shows small foci of ciliated epithelium. Compact masses of dark-staining cells that bear a resemblance to primitive follicular plate cells are also so common as to raise the possibility of their being a normal component with, possibly, an endocrine function. It has been suggested that they produce calcitonin, but this could not be confirmed. Peculiar granular cells replacing follicle cells were also noticed.
对350名婴幼儿甲状腺的一项调查表明，甲状腺内存在胸腺和甲状旁腺组织极为常见，可归类为正常现象。每一百个甲状腺中就有一个含有软骨块，每一百个中就有一个显示出小的纤毛上皮灶。紧密聚集的深染细胞与原始滤泡板细胞相似，也极为常见，以至于有可能成为具有内分泌功能的正常组成部分。有人认为它们产生降钙素，但这一点无法得到证实。还注意到有奇特的颗粒细胞取代滤泡细胞。
