CT attenuation of unilocular pancreatic cystic lesions to differentiate pseudocysts from mucin-containing cysts.

Published online

Journal Article

CONTEXT: There is extensive overlap among the imaging characteristics of pseudocyst, mucinous cystic neoplasm (MCN) and side branch intraductal papillary mucinous neoplasm (IPMN) on CT images. OBJECTIVE: The purpose of this study was to evaluate the usefulness of attenuation measurement in differentiating pseudocysts from MCN and IPMN of pancreas on CT images. PATIENTS: Seventy-five pathologically proven unilocular pancreatic cysts including 31 pseudocysts, 29 MCN and 15 IPMN imaged with multidetector computed tomography (MDCT) before resection were evaluated. MAIN OUTCOME MEASURES: Attenuation values were measured by conventional region of interest (ROI) method. DESIGN: Attenuation values (in Hounsfield unit, HU) were compared between the cyst pathologies. Receiver operating characteristic (ROC) curve analysis was performed to obtain the best attenuation threshold between mucin-containing cysts and pseudocysts. Correlation between attenuation values and cyst size was assessed. RESULTS: Maximum transaxial diameters of pseudocysts (4.5 cm), MCNs (3.7 cm) and IPMNs (4.0 cm) were comparable (P=0.919). Mean attenuation was 18.9 HU, 13.0 HU and 11.4 HU for pseudocyst, MCNs and IPMNs, respectively. Attenuations were significantly higher in pseudocysts versus mucin-containing (MCN+IPMN) cysts (P=0.001) and comparable between MCNs and IPMNs (P=0.390). ROC curve showed 14.5 HU the best cut-off (accuracy: 73.5%) for differentiating pseudocysts from mucin-containing cysts (P<0.001). Pancreatic cyst attenuation measurement did not significantly correlate with cyst size (r=-0.03, P=0.772). CONCLUSION: Attenuation measurement may help in differentiating pseudocysts from unilocular mucin-containing simple cysts of the pancreas on CT images.

Full Text

Duke Authors

Cited Authors

  • Chalian, H; Töre, HG; Miller, FH; Yaghmai, V

Published Date

  • July 8, 2011

Published In

Volume / Issue

  • 12 / 4

Start / End Page

  • 384 - 388

PubMed ID

  • 21737901

Pubmed Central ID

  • 21737901

Electronic International Standard Serial Number (EISSN)

  • 1590-8577


  • eng

Conference Location

  • Italy