I Cannot be diagnosed/unsatisfactory
Cyst fluid specimen
Low amount of epithelial cells
Other (e.g., more blood obscuring cells, excessive cell dryness, etc.)
Ⅱ Benign
Consistent with benign follicular nodules (including adenomatous nodules and glial nodules, etc.)
Consistent with Hashimoto’s thyroiditis
Consistent with subacute thyroiditis
III Atypical cells of undetermined significance/follicular lesions of undetermined significance
IV Follicular neoplasm/suspected follicular neoplasm
If eosinophilic tumor, please specify
V Suspicious malignant
Suspected papillary thyroid carcinoma
Suspected medullary thyroid carcinoma
Suspected metastatic carcinoma
Suspected lymphoma
VI Malignant
Papillary thyroid carcinoma
Hypofractionated carcinoma of thyroid
Medullary carcinoma of the thyroid
Undifferentiated carcinoma of the thyroid
Squamous cell carcinoma
Carcinoma of mixed components (specify specific components)
Metastatic malignancy
Non-Hodgkin’s lymphoma
Other