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Perfusion-weighted imaging in vestibular schwannoma: the influence that cystic status and tumor size have on perfusion profiles

OBJECTIVE: The perfusion profile of vestibular schwannomas (VSs) and the factors that influence it have yet to be determined. MATERIALS AND METHODS: Twenty patients with sporadic VS were analyzed by calculating parameters related to the extravascular extracellular space (EES)—the volume transfer con...

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Detalles Bibliográficos
Autores principales: Constanzo, Felipe, Teixeira, Bernardo Corrêa de Almeida, Sens, Patricia, Smaili, Hamzah, Escuissato, Dante Luiz, Ramina, Ricardo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Publicação do Colégio Brasileiro de Radiologia e Diagnóstico por Imagem 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10165972/
https://www.ncbi.nlm.nih.gov/pubmed/37168041
http://dx.doi.org/10.1590/0100-3984.2022.0035
Descripción
Sumario:OBJECTIVE: The perfusion profile of vestibular schwannomas (VSs) and the factors that influence it have yet to be determined. MATERIALS AND METHODS: Twenty patients with sporadic VS were analyzed by calculating parameters related to the extravascular extracellular space (EES)—the volume transfer constant between a vessel and the EES (Ktrans); the EES volume per unit of tissue volume (Ve); and the rate transfer constant between EES and blood plasma (Kep)—as well as the relative cerebral blood volume (rCBV), and by correlating those parameters with the size of the tumor and its structure (solid, cystic, or heterogeneous). RESULTS: Although Ktrans, Ve, and Kep were measurable in all tumors, rCBV was measurable only in large tumors. We detected a positive correlation between Ktrans and rCBV (r = 0.62, p = 0.031), a negative correlation between Ve and Kep (r = –0.51, p = 0.021), and a positive correlation between Ktrans and Ve only in solid VSs (r = 0.64, p = 0.048). Comparing the means for small and large VSs, we found that the former showed lower Ktrans (0.13 vs. 0.029, p < 0.001), higher Kep (0.68 vs. 0.46, p = 0.037), and lower Ve (0.45 vs. 0.83, p < 0.001). The mean Ktrans was lower in the cystic portions of cystic VSs than in their solid portions (0.14 vs. 0.32, p < 0.001), as was the mean Ve (0.37 vs. 0.78, p < 0.001). There were positive correlations between the solid and cystic portions for Ktrans (r = 0.71, p = 0.048) and Kep (r = 0.74, p = 0.037). CONCLUSION: In VS, tumor size appears to be consistently associated with perfusion values. In cystic VS, the cystic portions seem to have lower Ktrans and Ve than do the solid portions.