Can Ultrasound differentiate between benign and malignant gallbladder polypoid lesions (polyps)?
There are both benign (cholesterol, inflammatory) and malignant (gallbladder adenocarcinoma, metastases [most commonly melanoma]) gallbladder polyps. Benign polyps are very common and are typically multiple, oval, and less than 10 mm in size. In contrast, malignant polyps are more commonly single, sessile, and greater than 10 mm in size. Other risk factors for a malignant polypoid include age >60, gallstone disease, and rapid change in size.