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Metastatic olfactory neuroblastoma to thyroid. (a) Hyperchromatic tumor nuclei with nuclear molding surrounded by fibrillary matrix on fine-needle aspiration (×1000, Diff-Quik). (b) Crowded cellular aggregates with fibrillary neuropil-like processes on fine-needle aspiration (×400, Diff-Quik). (c) Thyroidectomy showing organoid tumor nests among remnant follicles (×200, H and E) with positive CD56 (d), chromogranin (e), and synaptophysin stains (f) (×200)
