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US-guided CNB procedure. (A) A 61-year-old female patient with well-defined hypoechoic nodule in the mid-pole of right thyroid gland; (B) planning of trans-isthmic approach with measurement of distance of fire (arrows); (C) firing of stylet. Specimen notch includes nodule, nodule capsule, and small amount of normal thyroid parenchyma; (D) firing of cutting cannula. CNB, core needle biopsy; US, ultrasound.
