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Dual time point 18F-FDOPA PET as a tool for characterizing brain tumors

González-Forero M, Prieto E [ES], Domínguez I, Vigil C, Peñuelas I [ES], Arbizu J [ES].
Servicio de Medicina Nuclear, Clínica Universidad de Navarra, Pamplona, Spain

Revisão:Revista Española de Medicina Nuclear

Data: 15/Mar/2011

Medicina Nuclear [ES]

(18)F-FDOPA is an amino acid analogue used to evaluate presynaptic dopaminergic activity, which has aroused great interest in neuro-oncology. We have evaluated five (18)F-FDOPA PET studies of patients referred for study of parkinsonian syndrome.

Two subjects had previously treated high-grade brain tumors, one nonspecific brain injury, and 2 subjects presented unexpected tumoral lesions. For all lesions SUVmax, time to SUVmax and tumor-to-normal grey matter SUVmax rate (T/N) were calculated, and 90 minutes (18)F-FDOPA kinetics were analyzed. Tumor lesions corresponded to three malignant neurocytomas, one meningioma, one pineocytoma and one intrasinusal hemangioma.

Both malignant and benign tumors exhibited high uptake of (18)F-FDOPA well above the normal cortex. However, the analysis of the curve uptake displayed characteristic patterns that facilitate the characterization of tumor lesions.

A dual phase maximum uptake was observed, with an early 10 minutes uptake in malignant lesions, and a late 60 to 90 minutes uptake in benign or low grade lesions.

CITAÇÃO DO ARTIGO  Rev Esp Med Nucl. 2011 Mar-Apr;30(2):88-93

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