May Be Caused by

 Common

Adenomyomatosis

Cholesterol polyp

Gallbladder carcinoma

Inflammatory polyp

Posttraumatic hematoma

 Uncommon

Adenoma

Carcinoid

Granular cell tumor

Hemorrhagic cholecystitis

Lymphoma

Metastasis

Neurofibroma

Xanthogranulomatous cholecystitis