On physical examination, she had a hard, nontender, baseball- sized mass in the right upper abdominal quadrant.
A computed tomographic scan showed that the calcification seen on the plain abdominal radiograph represented the wall of the gallbladder (image below). The scan also showed ascites, multiple lesions in the liver, and nodularity of the peritoneum and small bowel mesentery. These findings suggested metastatic carcinoma of the gallbladder, but the patient refused further investigation.
Authors: Herbert L. Fred, MD and Hendrik A. van Dijk
Original source: http://cnx.org/content/m14939/latest/