9 research outputs found
Évaluation de la TEP au 18-FDG dans l'exploration de la récidive des carcinomes colorectaux
Objectifs : le but de cette étude a été d'évaluer les performances diagnostiques et pronostiques de la TEP-FDG, ainsi que son impact sur la prise en charge thérapeutique, dans l'exploration de la récidive des carcinomes colorectaux. Matériels et méthodes : 60 examens TDM et TEP ont été réalisés chez 52 patients pour une suspicion de récidive de carcinome colorectal entre 2003 et 2005 au Centre Paul Papin. L'impact de l'examen TEP sur la prise en charge thérapeutique a été évalué par la révision des dossiers des réunions de concertation pluridisciplinaire. Une analyse statistique de la survie a été effectuée avec un suivi moyen de 2,2 ans. Résultats : la récidive a été confirmée pour 50 examens par l'histologie (n=32), le suivi radiologique (n=14) et clinique (n=4). Au terme du suivi, 20 patients étaient décédés de l'évolution carcinologique. Au niveau patient, les sensibilités, spécificités et exactitudes étaient de 90%, 90% et 90% pour la TEP et de 74%, 50%, et 70% pour la TDM. Les informations complémentaires apportées par la TEP ont modifié l'attitude thérapeutique dans 18 cas (30%). La positivité de la TEP, la présence d'une lésion hépatique ou d'au moins 2 lésions ganglionnaires en TEP ainsi que la présence d'au moins 2 lésions hépatiques en TDM ont été des facteurs péjoratifs sur la survie globale. La présence d'au moins 2 lésions hépatiques en TEP a été le seul facteur pronostique péjoratif indépendant en analyse multivariée. Conclusion : ces résultats confirment liimpact majeur de la TEP au 18-FDG dans le choix de la stratégie thérapeutique à adopter en cas de récidive suspectée de carcinome colorectal.ANGERS-BU Médecine-Pharmacie (490072105) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF
Dynamic cardiac SPECT with flow measurement using 3D-ring CZT: when SPECT is inspired by PET
International audienceNo abstract availabl
Potential utility of myocardial blood flow quantification with SPECT in a patient undergoing treatment for breast cancer
International audienceCardio-oncology is rapidly developing and aims to optimize diagnosis and management of cardiac complications of cancer treatment. PET can detect the presence of microvascular disease (MVD). Yet, limited clinical studies have applied cardiac PET to monitor for cancer therapy–related cardiotoxicity, with small number of patients, suggesting inverse correlations between Myocardial Flow Reserve (MFR) reduction after parietal radiotherapy (RT) (1, 2), mainly in the anterior territory, and after anthracyclines and RT (3). An animal longitudinal study recently reported MVD due to anthracyclines without contractile abnormality (4). MFR was also suggested as a risk stratification biomarker among breast cancer patients (5)
Comprehensive literature review of oral and intravenous contrast-enhanced PET/CT: a step forward?
International audienceThe integration of diagnostic CT scans into PET/CT facilitates a comprehensive single examination, presenting potential advantages for patients seeking a thorough one-shot check-up. The introduction of iodinated contrast media during PET scanning raises theoretical concerns about potential interference with uptake quantification, due to the modification of tissue density on CT. Nevertheless, this impact appears generally insignificant for clinical use, compared to the intrinsic variability of standardized uptake values. On the other hand, with the growing indications of PET, especially 18 F-FDG PET, contrast enhancement increases the diagnostic performances of the exam, and provides additional information. This improvement in performance achieved through contrast-enhanced PET/CT must be carefully evaluated considering the associated risks and side-effects stemming from the administration of iodinated contrast media. Within this article, we present a comprehensive literature review of contrast enhanced PET/CT, examining the potential impact of iodinated contrast media on quantification, additional side-effects and the pivotal clinically demonstrated benefits of an all-encompassing examination for patients. In conclusion, the clinical benefits of iodinated contrast media are mainly validated by the large diffusion in PET protocols. Contrary to positive oral contrast, which does not appear to offer any major advantage in patient management, intravenous iodine contrast media provides clinical benefits without significant artifact on images or quantification. However, studies on the benefit–risk balance for patients are still lacking
Osteonecrosis of the Femoral Head as a Potential Pitfall in 18F-PSMA-1007 PET
International audienceAbstract PSMA-targeted PET agents are mainly involved for prostate cancer; however, unspecific bone uptakes can be challenging for the clinician. We report the case of a 71-year-old man with history of recurrent prostate cancer initially treated by surgery and radiation therapy. 18 F-PSMA 1007 PET/CT was performed. Beside hyperfixing lymph nodes, focal uptake was found in right femoral head with shell subchondral hypofixation and no morphologic correlate on CT. MRI found bilateral osteonecrosis of the femoral head. This case emphasizes that osteonecrosis of the femoral head can mimic a metastasis uptake, even with normal CT, without however the fixation being constant
Uncommon breast tumor attenuation artifact on radionuclide ventriculography
International audienc