“…FNA cytomorphologic features include small and monotonous to moderately anisokaryotic cells that are present in cohesive cellular disorganized sheets, cords, cohesive three-dimensional groups, papillary fragments, and microfollicles (in 90% of parathyroid adenomas and absence in parathyroid hyperplasia), have round to oval hyperchromatic nuclei containing finely to coarsely granular chromatin and inconspicuous nucleoli, and have fragile, pale blue or finely granular cytoplasm with ill-defined borders (Absher, Truong et al 2002;Liu, Gnepp et al 2004;Owens, Rekhtman et al 2008) (Figure 8). Isolated cells and naked nuclei are commonly present and sometimes predominate (Absher, Truong et al 2002;Liu, Gnepp et al 2004;Owens, Rekhtman et al 2008), and rare case shows lymphoid-like smears (Absher, Truong et al 2002). Prominent nucleoli, mitotic figures, and karyolysis are seen in parathyroid carcinoma (Hara, Oyama et al 1998).…”