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Core needle biopsy of right thyroid nodule. (A) Core needle approach is made through isthmus. (B) Vessels are evaluated with Doppler ultrasound advanced along the direction of the needle. (C) Measurement of distance of fire. (D, E) Firing the stylet first followed by cutting cannula. (F) Schematic illustration of core needle biopsy showing the biopsy site. A cylindrical core of tissue includes tumor and adjacent non-tumor tissue.
