Mucin-producing pancreatic tumor: CT findings and histopathologic correlation.

Abstract

Twenty patients with mucin-producing pancreatic tumor and 60 with other pancreatic diseases underwent computed tomography (CT) to establish the CT characteristics of mucin-producing pancreatic tumor. Scans were obtained with thin sections by administering a large volume of contrast material (200 mL). Mucin-producing pancreatic tumors were divided into three subgroups, and the CT characteristics were as follows: Main duct type tumors consisted of a cystic mass in or communicating with the dilated main pancreatic duct (MPD). Excrescent nodules and/or septa were found in the cyst. The MPD was markedly dilated over its entire length. Branch duct type tumors consisted of clustered small cysts that were all approximately the same size in diameter (1-2 cm). Excrescent nodules or septa were not always seen. The MPD near the lesion was often slightly dilated. Peripheral type tumors consisted of a well-defined cystic mass with excrescent nodules and/or septa. Even if the cyst was multilocular, a large main cyst was in it. The MPD usually was not dilated. The CT findings corresponded to macroscopic findings. Mucin-producing pancreatic tumor can be differentiated from other pancreatic diseases with these criteria.

Multicenter Analysis of Clinicopathologic Features of Intraductal Papillary Mucinous Tumor of the Pancreas: Is It Possible to Predict the Malignancy Before Surgery?

“…However, most of these reports are based on a small number of patients and univariate analysis, and, therefore, conclusions of a high malignancy rate for the main duct type should be treated as tentative. [22][23][24] Another pitfall in this classification is the discrepancy between the dilated ductal segments and the actual presence of tumor cells. 21 Kamisawa et al 25 reported two autopsy cases of benign IPMT of the main pancreatic duct type in patients who were followed up for approximately 10 years.…”

Ductectatic mucinous cystic neoplasms of the pancreas: evaluation with MR cholangiopancreatography.

“…Mural nodule and papillary projections were confirmed on resected specimen. On CT scans, an IV bolus injection of con trast medium using contiguously thin-sec tion slices (5 mm) is recommended to fully visualize cystic components of mucin-pro ducing pancreatic tumors [4]. MRCP needs no injection of contrast material and can pro vide the precise projection images of the cystic lesions.…”

“…On CT and sonography, the tumor appears as clustered small cystsor asa cystic lesionwith a lobulated or irregular marginandsparse septa, characteris tics that are often associated with dilatation of the pancreatic duct near the lesion [4,5].…”

The Role of Volume Perfusion CT in the Diagnosis of Pathologies of the Pancreas

“…Microcystic adenomas are the most common variant. As a rule they are benign and are comprised of a central scar with surrounding small cysts [26]. The scar can contain calcifications.…”