Right upper quadrant pain is a possible symptom of the benign disorder adenomyomatosis, characterized by hyperplasia of the muscularis propria and gallbladder wall mucosa and pathognomonic epithelial invaginations that generate cystic pockets.
Adenomyomatosis - All About Gallbladder Diverticula
Adenomyomatosis is caused by the thickening of the muscle wall of the gallbladder due to the growth of small nodules within the muscle.