Thyroiditis. (a) Grade 1 thyroiditis characterized by the presence of increased number of lymphocytes in the background (PAP stain, ×200) (b) Grade 2 thyroiditis showing the presence of Hurthle cells, epithelioid cells, giant cells, and anisonucleosis and increased number of lymphocytes (PAP stain, ×200) (c) Grade 2 thyroiditis showing the presence of Hurthle cells with lymphocytic infiltration (PAP stain, ×400) (d) Grade 3 thyroiditis characterized by the presence of florid lymphocytic infiltration (PAP stain, ×200). Cytomorphologic spectrum of lymphocytic thyroiditis and correlation between cytological grading and biochemical parameters: Journal of Cytology / Indian Academy of Cytologists. Not Altered. CC.