Figure 2.

Representative case of correct reclassification of a US indeterminate LN with the addition of CT in a 48-year-old woman with PTC. (a) On US, an ovoid LN (arrow) with neither echogenic hilum nor suspicious feature was noted at the left neck level IV. The LN was classified as an indeterminate LN on US. (b) The LN, however, was shown to have a focal strong contrast enhancement (arrow) on CT, which led to correct reclassification of the LN as a suspicious LN. The final diagnosis based on FNA turned out to be metastasis. Correct changes in the classification were made in 5.1% (14 of 274) of the LNs enrolled, and the addition of CT helped identify additional metastasis in 6.2% (14 of 225) of the patients enrolled.