Revision 8 for 'Gallbladder polyp'
A gallbladder polyp is defined as any elevated lesion of the mucosal surface of the gallbladder. They are relatively frequent, seen in around 5% of the population. They are typically asymptomatic and incidentally found. 1
The pathology of gallbladder polyps is variable. They are most frequently benign pseudotumours or benign tumours but a small proportion can be malignant (~5%) 2.
Benign polyps (~95%)
- cholesterol polyps ( > 50% of all polyps)3
- adenoma ( ~ 30%, possibly premalignant)4
- inflammatory polyps
- heterotrophic gastric or pancreatic tissue
- granulosa cell tumour
Malignant polyps (~5%)
- adenocarcinoma (~90% of malignant polyps)
- metastasis into gallbladder
- squamous cell carcinoma
Peutz-Jeghers syndrome : increased prevalence of adenomas within the gallbladder.
Non shadowing polypoid ingrowth into gallbladder lumen. Usually immobile unless there is a relatively long pedunculated component.
May show focal rounded thickening of the gall bladder wall