Importance of Foamy Macrophages Only in Fine Needle Aspirates to Cytologic Diagnostic Accuracy of Cystic Metastatic Papillary Thyroid Carcinoma

To investigate the important cytologic features and thyroglobulin (Tg) level in fine needle aspiration cytology (FNAC) of cystic metastasis of papillary thyroid carcinoma (PTC) and to find some independent cytologic factors that enhance the diagnostic accuracy of cystic lymph node metastasis without identifiable tumor cells or high levels of Tg.Two hundred forty-four aspiration cytology cases with correspondent tissue specimens were included in...