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A thyroid papillary carcinoma (1.1 cm × 1.0 cm) in the left thyroid lobe of a 56-year-old woman was found to have concentric hypo-enhancement. (A) Conventional US showed a solid hypo-echoic nodule; (B) fourteen seconds after injection of microbubbles CEUS indicated hypo-enhancement; (C) in 20 s, the area of hypo-enhancement within the nodule shrank. Arrowheads indicate nodule margins. US, ultrasound; CEUS, contrast-enhanced ultrasound.
