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(a) Tumour composed of well-confined spindle cells, separated by a capsule from the thyroid tissue (haematoxylin and eosin staining; original magnification, × 10). (b) Tumour containing biphasic cell proliferation consisting of spindle and epithelial cells. Mucous deposits are seen between cells (haematoxylin and eosin staining; original magnification, × 10). (c) Immunopositivity of the tumour with cytokeratin AE1/AE3 (original magnification, × 20).
