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Figure 2: Follicular adenoma, Hürthle cell type. (a) The aspirate consists of a pure population of Hürthle cells in small, crowded groups and as isolated cells in a background that lacks colloid and lymphocytes. The cells are highly variable in size and amount of cytoplasm (smear, Diff-Quik stain). (b) The tumor is completely surrounded by a thin fibrous capsule. Predominant microfollicular pattern, nuclei are round, uniform, and nonoverlapping. The component cells have deeply eosinophilic, granular cytoplasm (hematoxylin-eosin, original magnifications ×200)

Figure 2: Follicular adenoma, Hürthle cell type. (a) The aspirate consists of a pure population of Hürthle cells in small, crowded groups and as isolated cells in a background that lacks colloid and lymphocytes. The cells are highly variable in size and amount of cytoplasm (smear, Diff-Quik stain). (b) The tumor is completely surrounded by a thin fibrous capsule. Predominant microfollicular pattern, nuclei are round, uniform, and nonoverlapping. The component cells have deeply eosinophilic, granular cytoplasm (hematoxylin-eosin, original magnifications ×200)