Abstract
To evaluate the possibility of preoperatively obtaining an index of aggressiveness for intracranial meningiomas, we prospectively studied 22 patients with computed tomography or magnetic resonance imaging evidence of meningeal tumour, using single-photon emission tomography (SPET) of the brain and thallium-201 (201Tl). On a brain-dedicated SPET scanner, a rapid acquisition protocol with early, short scans was started simultaneously with the intravenous administration of 111 MBq201Tl, covering the initial intratumoral distribution of the tracer. Twenty minutes post injection, a delayed SPET scan was also obtained. On the reconstructed and attenuation-corrected images we calculated the201Tl concentration in tumour and normal contralateral brain tissue, and compared intratumoral tracer concentration in the initial and the final part of the rapid acquisition protocol. Benign and malignant meningiomas were classified as such based on histological examination. In malignant lesions, the ratio of the201Tl concentration at 2–4 min post injection to that at 14–16 min was found to be significantly higher than in non-aggressive neoplasms (mean±1 SD: 1.14±0.31 and 0.56±0.13, respectively,P <0.01). Conversely, in the delayed scan, most lesions showed high tracer concentration, and the two groups could not be distinguished. In addition, three recurrent meningiomas displayed the same imaging behaviour as the malignant group, i.e. had similar201Tl concentration values at 2–4 and at 14–16 min. Our findings suggest that the comparative assessment of intratumoral201T1 concentration at 2–4 and at 14–16 min post injection could provide a fast, simple method to differentiate preoperatively intracranial meningiomas with different biological behaviour.
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Tedeschi, E., Soricelli, A., Brunetti, A. et al. Different thallium-201 single-photon emission tomographic patterns in benign and aggressive meningiomas. Eur J Nucl Med 23, 1478–1484 (1996). https://doi.org/10.1007/BF01254472
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DOI: https://doi.org/10.1007/BF01254472