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RADIOLOGY: PANCREAS: Case# 58: PANCREATIC CA C PERITONEAL & OMENTAL METS. 72 year old man with abdominal pain and weight loss. Ultrasound performed earlier today showed mass lesions in the region of the pancreatic head and ascites. There are multiple low attenuation lesions present throughout both the left and right lobe of the liver, most measuring 1 cm or less. There are multiple low attenuation lobular lesions extending superiorly from the neck and body of the pancreas. The head of the pancreas appears relatively spared. There is mild dilatation of the pancreatic duct within the body and tail of the pancreas, with atrophy of the tail of the pancreas. There is thickening of the omentum anterior to the liver. There is retrocrural, aortocaval, para-aortic, and portocaval adenopathy present. There are soft tissue implants adjacent to the medial aspect of the spleen. There are clips in the gallbladder bed consistent with previous cholecystectomy. The left adrenal gland appears thickened. This almost uniformly fatal cancer is the 4th most common malignant tumor accounting for 5% of cancer deaths in the United States. Symptoms are usually nonspecific and insidious such that the cancer is advanced by the time of diagnosis. Most cancers occur in the head of the pancreas and are usually adenocarcinomas arising from ductal cells. The sensitivity of CT scan in diagnosing pancreatic carcinoma is approximately 95% whereas that of ultrasound is less than 80% for cancer of the head and 40% for the tail. The primary finding on CT is a focal mass;however, if no mass is present, other findings may suggest neoplasm. First, the pancreas may become more heterogeneous in density with age. Thus, a focal region of homogeneous soft tissue density might raise suspicion of a carcinoma. The presence of both a dilated common bile duct and a dilated main pancreatic duct in the absence of calculus suggests ampullary or pancreatic head neoplasm, but this may also be seen in benign disease. The finding of a dilated main pancreatic duct in the body or tail but not in the head or neck suggests neoplasm, and finally, the finding of rounded convex borders of both anterior and posterior surfaces of the uncinate process raises suspicion for carcinoma. Ten to fifteen percent of patients will have potentially resectable tumors, and they may be distinguished by CT findings. Signs of potential resectability include an isolated pancreatic mass with or without dilatation of the bile and pancreatic ducts and combined bile-pancreatic duct dilatation without an identifiable pancreatic mass. Extension of the tumor beyond the margins of the pancreas, involvement of adjacent organs or the SMA, liver metastases, ascites, and regional adenopathy are signs of unresectability. Unfortunately, most of those who undergo resection eventually die of pancreatic cancer.

Author
Peter Anderson
Keywords
pancreas, radiology
Visits
724

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