Signet-ring cell carcinoma of ampulla of Vater: Contrast-enhanced ultrasound findings

Figure 1 A heterogenic and hypoechoic mass (MASS) with ill-defined margin about 2. 7 cm × 1.8 cm at the junction of the CBD and MPD.

Figure 2 The end part of the CBD (arrow), which suddenly became narrow with a diameter of 0. 7 cm. There was no exact mass detected.

Figure 3 The wall of the CBD enhanced at 12 s after contrast agent was administered, while there was no obvious hyper-enhanced or hypo-enhanced lesion in the ampulla of Vater.

Figure 4 A hypo-enhanced lesion about 1. 7 cm × 1.6 cm with blurred borders in the ampulla of Vater, from 20 s to 180 s, in comparison with the adjacent pancreas Pac.

Figure 5 Micrograph shows SRCC of ampulla of Vater (HE × 100).