| Few papillary carcinoma-suspected cells or components (pseudo inclusions, nuclear grooves, psammoma bodies, septate intracytoplasmic vacuoles, papillary structure) |
| Atypical cells in benign follicular tumor |
| Atypical cells in chronic thyroiditis |
| Atypical cells in cystic fluid material |
| Psammoma bodies in benign follicular lesions |
| Cellular sample with mild nuclear features of papillary carcinoma |
| (II) Medullary carcinoma is possible or not excluded |
| Salt and pepper chromatin, extremely eccentric nuclei, amyloid materials, spindle cells, large hyperchromatic nuclei |
| (III) Undetermined atypical cells, Undetermined mesenchymal cells |
| (IV) Hashimoto thyroiditis or lymphoma |
| (V) Benign lesion or malignant lesion, Unknown tumorous lesion |
