O-104 One-Stop-Shop imaging for cancer diagnosis in the Caribbean: an Integrated PET-CT and PET-MRI approach
Author(s):
K Fard, S Masson, P D’Abadie, A D’Abadie, G Crespel
Year of Presentation:
2026
Objective: Cancer staging typically requires both local
assessment by pelvic MRI and whole-body evaluation by
PET-CT. In cancers of organs such as prostate and uterus,
these complementary modalities are recommended but usually performed sequentially. At the Caribbean Institute of
Nuclear Imaging (ICIN) in Martinique, both examinations
are combined after single radiotracer injection—the “OneStop-Shop” (OSS) protocol—pairing pelvic PET-MRI with
whole-body PET-CT. This study aims to evaluate the indications and clinical benefits of this protocol across major
oncologic indications, with a specific focus on prostate
cancer and the diagnostic added value of PSMA PET-MRI
over conventional MRI for local tumour assessment
Methods: A retrospective observational study was conducted using ICIN activity data from May 2024 to December 2025. An OSS examination was defined as the completion, on the same day, of a PET-with contrast CT and targeted PET-multiparametric MRI for the same patient and indication. These included prostate cancer using PSMA tracers, gynecologic pelvic malignancies, and breast cancer. For prostate cancer, clinical contexts included post-biopsy staging, biochemical recurrence, and post-radiotherapy evaluation.
Results: Since May 2024, 9,925 PET-CT examinations were performed and 1,300 patients benefited from an OSS pathway. Prostate cancer accounted for most OSS examinations (86.1%, n=1,119), followed by gynecologic pelvic cancers (13.4%, n=174) and breast cancer (<1%, n=7). In prostate cancer, OSS imaging was mainly performed for post-biopsy staging (46%) and recurrence assessment (42%), including patients evaluated after radiotherapy. The integrated PET-CT and PET-MRI approach provided comprehensive loco-regional and whole-body assessment within a single session.
Conclusion: The OSS imaging model simplifies diagnostic workflows by combining two complementary modalities in a single visit and after a single injection. This approach enables timely and comprehensive evaluation for initial staging, recurrence, and post-treatment assessment, and represents a particularly relevant strategy for oncologic imaging in island healthcare settings.