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A case of pancreatic cancer. (a) Endoscopic ultrasound images before chemotherapy. Conventional endoscopic ultrasound (left image) shows low-echoic mass in the pancreatic head. Contrast-enhanced harmonic endoscopic ultrasound (right image) is showing the avascular area in the tumor (arrows). (b) Endoscopic ultrasound images after chemotherapy. Avascular area decreased on contrast-enhanced harmonic endoscopic ultrasound (right image)
