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Updated: Jan 25, 2026

Implantation and Monitoring by PET/CT of an Orthotopic Model of Human Pleural Mesothelioma in Athymic Mice
Published on: December 21, 2019
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.
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.
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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