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letter
. 2011 Apr 25;12(3):400–401. doi: 10.3348/kjr.2011.12.3.400

Fig. 1.

Fig. 1

Patient who presented with poorly-differentiated papillary thyroid carcinoma.

Doppler US shows large vessel (arrows) crossing from side-to-side in suspicious left hypoechoic thyroid nodule (arrowhead), as sword would do ("sword sign"). Fine-needle aspiration biopsy confirmed high grade malignancy of this aggressive nodule.