흉곽 내 림프절에서 발생한 원발성 갑상선 유두상 암종 1예

Abstract

A primary papillary thyroid carcinoma in the intrathoracic lymph node is very rare. There are two potential explanations of the lesion. The first possibility of the lesion is metastatic disease from an occult primary thyroid papillary microcarcinoma. Other possibility is malignant transformation of the aberrant thyroid tissue within the intrathoracic lymph node, which is the favored etiology in this case. We experienced an extremely rare case of true intrathoracic thyroid cancer in a 78-year-old woman, presenting with an intrathoracic malignancy. We confirmed it as papillary thyroid cancer, but there were no primary sites of thyroid glands. So, we report this rare case of a primary papillary thyroid carcinoma in the intrathoracic lymph node.