Intraductal papillary mucinous neoplasm - side branch type (CT)


Intraductal papillary neoplasms (IPMN) can be of two types - main duct and branch duct. This is the latter with small cystic lesions, and the key to diagnosis is recognizing communication with the main duct. Multifocal IPMN has, unsurprisingly, increased risk of malignant transformation. Imaging features suggestive of that include:

  • increased size >3 cm
  • nodules > 2 mm
  • enhancing nodules or septations
  • dilated main pancreatic duct

In this case, the lesions had grown slightly over 3 years with a few new lesions. There has been no further characterization with MRI, and surgery/biopsy has not been performed.