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Figure 1: A Subacute granulomatous thyroiditis case sonographically characterized by an ill-defined hypoechoic nodule (case no. 17). (a) An ultrasound image showing a ill-defined nodule. The cytologic features of the case included the following: (b) Multi-nucleated giant cell (Papanicolau stain, ×400), (c) an epithelioid histiocytic granuloma (Papanicolau stain, ×400), (d) a group of epithelioid histiocytes adjacent to a giant cell (Papanicolau stain, ×400) and (e) a collection of proliferated follicular cells (Papanicolau stain, ×200)

Figure 1: A Subacute granulomatous thyroiditis case sonographically characterized by an ill-defined hypoechoic nodule (case no. 17). (a) An ultrasound image showing a ill-defined nodule. The cytologic features of the case included the following: (b) Multi-nucleated giant cell (Papanicolau stain, ×400), (c) an epithelioid histiocytic granuloma (Papanicolau stain, ×400), (d) a group of epithelioid histiocytes adjacent to a giant cell (Papanicolau stain, ×400) and (e) a collection of proliferated follicular cells (Papanicolau stain, ×200)