Abdominal aortic aneurysm can cause a pulsating mass around the navel. ; Bladder distention (urinary bladder over-filled with fluid) can cause a firm mass in the center of the lower abdomen above the pelvic bones, and in extreme cases can extend as far up as the navel. ; Cholecystitis can cause a very tender mass that is felt below the liver in the right-upper quadrant (occasionally). ; Colon cancer can cause a mass almost anywhere in the abdomen. ; Crohn's disease or bowel obstruction can cause multiple tender, sausage-shaped masses anywhere in the abdomen. ; Diverticulitis can cause a mass that is usually located in the left-lower quadrant. ; Gallbladder tumor can cause a moderately tender, irregularly shaped right-upper quadrant mass. ; Hydronephrosis (fluid-filled kidney) can cause a smooth, spongy-feeling mass in one or both sides or toward the back (flank area). ; Kidney cancer can sometimes cause a mass in the abdomen. ; Liver cancer can cause a firm, lumpy mass in the right upper quadrant. ; Liver enlargement (hepatomegaly) can cause a firm, irregular mass below the right rib cage (right costal margin), or on the left side in the stomach area (epigastric). ; Neuroblastoma , a malignant tumor often found in the lower abdomen, that primarily occurs in children and infants. ; Ovarian cyst can cause a smooth, rounded, rubbery mass above the pelvis in the lower abdomen. ; Pancreatic abscess can cause a mass in the upper abdomen in the epigastric area. ; Pancreatic pseudoc
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