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Non-hyperfunctioning pancreatic endocrine tumors: multimodality imaging features with histopathological correlation.

Peter E Humphrey1,2, Francesco Alessandrino3, Andrew M Bellizzi4,5

  • 1Northwest Imaging, Kalispell Regional Medical Center, Kalispell, MT, 59901, USA.

Abdominal Imaging
|May 21, 2015
PubMed
Summary

Non-hyperfunctioning pancreatic endocrine tumors (NF-PNET) are typically oval, solid, and well-defined masses. Imaging features like low T2 signal intensity can correlate with intratumoral fibrosis in these tumors.

Keywords:
Magnetic resonance imagingMultidetector computed tomographyNeuroendocrine tumorsNon–hyperfunctioning neuroendocrine tumorsPancreasSomatostatin receptor scintigraphy

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Area of Science:

  • Radiology
  • Oncology
  • Endocrinology

Background:

  • Non-hyperfunctioning pancreatic endocrine tumors (NF-PNET) represent a subset of neuroendocrine neoplasms.
  • Accurate preoperative characterization of NF-PNETs is crucial for diagnosis and treatment planning.

Purpose of the Study:

  • To evaluate the multimodality imaging features of non-hyperfunctioning pancreatic endocrine tumors (NF-PNET).
  • To correlate imaging findings with histopathological characteristics.

Main Methods:

  • Retrospective analysis of preoperative imaging (CT, MRI, (111)In-octreotide) in 28 patients with resected NF-PNET.
  • Histopathological assessment of tumor fibrosis, vascularity, capsule presence, and grade.
  • Statistical correlation between imaging features and histopathology using the Fisher-Freeman-Halton exact test.

Main Results:

  • NF-PNETs most commonly appeared as solid, oval, well-defined/encapsulated masses, predominantly hypovascular on late arterial/portal venous phases.
  • Low signal intensity on T2-weighted MRI correlated significantly with extensive intratumoral fibrosis (p=0.003).
  • Cystic degeneration was observed in some NF-PNETs, independent of tumor size.

Conclusions:

  • NF-PNETs exhibit variable imaging appearances but share common characteristics such as oval shape, solid composition, and encapsulation.
  • Hypovascularity in the late arterial and portal venous phases is a frequent finding.
  • T2-weighted MRI signal intensity is a valuable indicator of intratumoral fibrosis in NF-PNETs.