Loco-regional staging of malignant pleural mesothelioma by integrated 18F-FDG PET/MRI

D J Murphy1, S M Mak2, A Mallia1

  • 1King's College London & Guy's and St Thomas' PET Centre, London UK; Department of Cancer Imaging, School of Biomedical Engineering and Imaging Sciences, King's College London, London UK.

Abstract

Insights

18F-FDG PET/MRI shows promise for staging malignant pleural mesothelioma (MPM), offering potentially more accurate loco-regional staging compared to PET/CT. This imaging technique demonstrated higher concordance with pathological staging, especially for T staging in MPM patients.

Area of Science:

  • Oncology
  • Radiology
  • Nuclear Medicine

Background:

  • Malignant pleural mesothelioma (MPM) staging is crucial for treatment planning.
  • Accurate loco-regional staging is essential for determining the optimal therapeutic strategy in MPM.
  • Current staging methods have limitations in precisely assessing the extent of disease.

Purpose of the Study:

  • To evaluate the performance of 18F-FDG PET/MRI in the loco-regional staging of MPM.
  • To compare the accuracy of 18F-FDG PET/MRI with 18F-FDG PET/CT and pathological staging.
  • To assess inter-observer agreement for MPM staging using 18F-FDG PET/MRI.

Main Methods:

  • Prospective study of consecutive MPM patients undergoing pre-operative staging with 18F-FDG PET/CT and same-day integrated 18F-FDG PET/MRI.
  • Clinical TNM staging performed by two independent readers on 18F-FDG PET/MRI.
  • Comparison of 18F-FDG PET/MRI and 18F-FDG PET/CT staging with final pathological stage.

Main Results:

  • 18F-FDG PET/MRI showed 67% concordance with pathological staging, compared to 33% for 18F-FDG PET/CT.
  • T staging concordance was 78% for 18F-FDG PET/MRI versus 33% for 18F-FDG PET/CT.
  • N staging concordance was 78% for both modalities. Good inter-observer agreement was noted for overall PET/MRI staging.

Conclusions:

  • 18F-FDG PET/MRI is a feasible technique for clinical staging of MPM.
  • 18F-FDG PET/MRI potentially offers more accurate loco-regional staging than 18F-FDG PET/CT, particularly for T staging.
  • Further studies are warranted to confirm the role of 18F-FDG PET/MRI in MPM management.

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