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a Pleural biopsy discloses transition between papillary thyroid carcinoma and anaplastic sarcomatoid carcinoma component (H–E, ×200). Both papillary thyroid carcinoma and anaplastic carcinoma were positive for TTF-1 (b), galectin-3 (c) and PAX-8 (d). TTF1 and PAX8 staining were positive in the nucleus and galectin-3 staining was positive in both the nucleus and cytoplasm
