A 45 year old female patient presented with features of hypothyroidism. Histopathology is shown below. Based on histological features, what is your diagnosis?: (A) Hashimoto thyroiditis, (B) Granulomatous thyroiditis, (C) Papillary carcinoma of thyroid, (D) Reidel's thyroiditis
Answer is A. Given histopathological slide shows extensive infiltration of thyroid parenchyma by mononuclear inflammatory infiltrate, well-developed germinal centers & Huhle cells. These features along with the history suggests the diagnosis of Hashimoto thyroiditis.