A tiny echogenic spot or an aggregation of echogenic spots and multiple microcysts or comet tail artifact is pathognomonic for cholesterol polyp and adenomyomatosis, respectively. Polypoid lesions without these findings indicate adenoma or adenocarcinoma on EUS. Routine use of EUS is recommended for differential diagnosis of polypoid gallbladder lesions when ultrasonography shows no signs indicative of either cholesterol polyp or adenomyomatosis.

Endoscopic ultrasonography is the most accurate tool for detecting pancreatobiliary carcinomas and assessing portal venous invasion.

No abstract

Images Fig. 1

No abstract