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

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Abstract

Aim
To examine the performance of 18F-FDG PET/MRI in the loco-regional staging of malignant pleural mesothelioma (MPM).
Methods
Consecutive subjects with MPM undergoing pre-operative staging with 18F-FDG PET/CT who underwent a same day integrated 18F-FDG PET/MRI were prospectively studied. Clinical TNM staging (AJCC 7th edition) was performed separately and in consensus by two readers on the 18F-FDG PET/MRI studies, and compared with staging by 18F-FDG PET/CT, and with final pathological stage, determined by a combination of intra-operative and histological findings.
Results
10 subjects (9 male, mean age 68 years) with biopsy-proven MPM (9 epithelioid tumours, 1 biphasic) were included. One subject underwent neo-adjuvant chemotherapy between imaging and surgery and was excluded from the clinical versus pathological stage analysis. Pathological staging was concordant with staging by 18F-FDG PET/MRI in 67% (n=6) of subjects, and with 18F-FDG PET/CT staging in 33% (n=3). Pathological T stage was concordant with 18F-FDG PET/MRI in 78% (n=7), and with 18F-FDG PET/CT in 33% (n=3) of subjects. Pathological N stage was concordant with both 18F-FDG PET/MRI and 18F-FDG PET/CT in 78% (n=7) of cases. No subject had metastatic disease. There was good inter-observer agreement for overall PET/MRI staging (weighted kappa 0.63) with moderate inter-reader agreement for T staging (weighted kappa 0.59). All 6 subjects with prior talc pleurodesis demonstrated mismatch between elevated FDG uptake and restricted diffusion in areas of visible talc deposition.

Conclusion
Clinical MPM staging by 18F-FDG PET/MRI is feasible, and potentially provides more accurate loco-regional staging than PET/CT, particularly in T staging.
Original languageEnglish
Pages (from-to)46-52
Number of pages7
JournalEuropean journal of radiology
Volume115
Early online date5 Apr 2019
DOIs
Publication statusPublished - 1 Jun 2019

Keywords

  • Fluorodeoxyglucose F18
  • Magnetic resonance imaging
  • Mesothelioma
  • Neoplasm
  • Positron emission tomography computed tomography
  • Staging

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