It is quite difficult to distinguish carcinoma from other types of benign polypoid lesions of the gallbladder with ultrasound. We experienced 14 patients with polypoid lesions of the gallbladder in whom ultrasound examination and cholecystectomy were performed and echo levels of the polypoids and histological types were compared.
The echogenicity of cholesterol polyps and adenomyomatosis in abundance with Rokitansky-Aschoff sinuses were higher than that of the liver parenchyma at the same depth. However, adenomyomatosis with a few Rokitansky-Aschoff sinuses had almost the same echo level with the liver parenchyma. Adenomas of the gallbladder had the higher echo level than carcinomas.
Hystological findings suggest that the echogenicity of polypoid lesions of the gallbladder depend on the volume density of the ductal structures, the cystic formations and / or the foam cells.