GAMUT G-116
FIXED POLYPOID LESION(S) OR FILLING DEFECT(S) IN THE GALLBLADDER (Ultrasound, CT, MRI)


COMMON
*1. Adenomyoma; adenomyomatosis; hyperplastic cholecystosis
*2. Cholesterol polyp 
*3. Cholesterolosis ("strawberry" gallbladder)
*4. Gallstone , adherent
5. [Phrygian cap]


UNCOMMON
*1. Adenoma (incl. adenomatous polyp; villous adenoma; papilloma; fibroadenoma; cystadenoma)
*2. Cholecystitis glandularis proliferans
3. Congenital fold or septum
4. Cyst (epithelial; mucous retention)
5. Ectopic pancreatic or gastric tissue
*6. Hamartomas in Peutz-Jeghers S.
*7. Inflammatory polyp
8. Metachromatic leukodystrophy
*9. Metastasis (esp. melanoma)
10. Neoplasm, benign (eg, carcinoid; schwannoma {neurinoma}; angioma)
11. Neoplasm, malignant  (eg, adenocarcinoma; leiomyosarcoma)
*12. Parasitic granuloma (eg, Ascaris)
13. Postoperative defect
14. [Pseudodefect in neck of gallbladder; other pseudopolyps]
*15. Vascular lesion (eg, varix; aneurysm; tortuous artery)
16. Xanthogranulomatous cholecystitis


* May be multiple.

[    ] This condition does not actually cause the gamuted imaging finding, but can produce imaging changes that simulate it.




References