Abstract
Fine needle aspiration (FNA) biopsy is an established procedure by which to sample thyroid nodules to ascertain etiology and produce a diagnosis conveying risk of malignancy with recommended patient follow-up. This procedure is well-tolerated and endorsed given the accessibility and vascularity of the thyroid gland. FNA cytopathology has proven efficacious for the primary assessment of thyroid nodules. Well-differentiated papillary thyroid carcinoma (PTC) and benign lymphocytic (Hashimoto) thyroiditis (HT) are distinct thyroid lesions that may be reported with diagnostic confidence based on their characteristic cytomorphologic features. However depending on the adequacy of FNA sampling and the morphology of aspirated cellular material, thyroid nodules with coexisting PTC and HT may pose diagnostic pitfalls. This may be dependent upon: (a) the architectural nature of the coexisting lesions in-vivo; (b) whether both lesions are adequately sampled through FNA; and (c) which of the cell types and cytomorpholo...
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