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A narrow-based periphery lung lesion (cancer nodule) on computed tomography (CT), gray-scale ultrasound and contrast enhanced ultrasound (CEUS). (A) CT imaging scan in sagittal view; (B) CT imaging scan in transverse view; (C) being affected by gas interference, the lesion displays unclear edge hypoechoic area on gray-scale ultrasound; (D) the lesion displays a circular high enhancement around it in early phase on CEUS.
