Gallbladder Polyp

Imaging

• Single or multiple small, round/ovoid masses attached to gallbladder (GB) wall with no posterior acoustic shadowing

  • Usually sessile but may be pedunculated with well-defined stalk

• Usually 2-10 mm in size, most commonly in middle 1/3 of GB

• Cholesterol polyp: Small with comet-tail artifact

• Avascular or hypovascular on Doppler examination

  • Larger lesions may have slight internal vascularity

• Consider neoplastic GB polyp if size > 10 mm, irregular outline, sessile morphology with abnormal GB wall and invasion of adjacent structures, growth on serial US examinations