Fig. 1. Representative sonic views for long- and short scope position. (A) Sonic view of long scope position depicts a hypoechoic tumor neighboring portal vein or superior mesenteric vein, distal common bile duct and head portion of pancreas parenchyma. The mass lesion usually located near the echoendoscope. (B) Sonic view of short scope position depicts a hypoechoic tumor with no distinctively seen neighboring distal common bile duct, portal vein and superior mesenteric vein. The mass lesion usually located far from the echoendoscope.
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