在淋巴结内肥大细胞密集于淋巴小结的周围区，在中央区则少见，但在髓质内可见有弥散性分布。
Mast cells densely lied in circumambience of lymphoid nodule and sparsely in central zone, but diffusely distributed in medulla.
颈中央区淋巴结转移率最高(46.8%)，并且小的转移淋巴结ct不能发现而出现5例假阴性。
Metastatic rate of lymph node in neck central area was the highest (46.8%), but micrometastasis of lymph node couldn't be found with CT leading to false negative in 5 cases with PTC.
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