Table 1 Shows the modified Thy Classification

Thy1: non-diagnostic or inadequate sample

Thy2: non-neoplastic or benign (features consistent with a nodular goiter or thyroiditis)

Thy3: all follicular lesions. (classified as a follicular lesion/suspected follicular neoplasm)

Thy4: abnormal, suspicious of malignancy (suspicious, but not diagnostic, of papillary, medullary or anaplastic carcinoma or of lymphoma)

Thy5: diagnostic of malignancy (unequivocal features of papillary, medullary or anaplastic carcinoma, or of lymphoma or of metastatic tumor)