Prognostic value of brain perfusion by MRI in the initial study of high grade gliomas.

OBJECTIVES: To evaluate if the tumour perfusion at the initial MRI scan is a marker of prognosis for survival in patients diagnosed with High Grade Gliomas (HGG). To analyse the risk factors which influence on the mortality from HGG to quantify the overall survival to be expected in patients. PATIENTS AND METHODS: The patients diagnosed with HGG through a MRI scan in a third-level hospital between 2017 and 2019 were selected. Clinical and tumour variables were collected. The survival analysis was used to determine the association between the tumour perfusion and the survival time. The relation between the collected variables and the survival period was assessed through Wald's statistical method, measuring the relationship via Cox's regression model. Finally, the type of relationship that exists between the tumour perfusion and the survival was analysed through the Lineal Regression method.Those statistical analysis were carried out using the software SPSS v.17. RESULTS: 38 patients were included (average age: 61.1 years old). The general average survival period was 20.6 months. A relationship between the tumour perfusion at the MRI scan and the overall survival has been identified, in detail, a group with intratumor values of relative cerebral blood volume (rCBV)>3.0 has shown a significant decline in the average survival period with regard to the average survival period of the group with values <3.0 (14.6 months vs. 22.8 months, p = 0.046). It has also been proved that variables like Karnofsky's scale and the response time since the intervention significantly influence on the survival period. CONCLUSIONS: It has become evident that the tumour perfusion via MRI scan has a prognostic value in the initial analysis of HGG. The average survival period of patients with rCBV less than or equal to 3.0 is significantly higher than those patients whose values are higher, which allows to be more precise with the prognosis of each patient.

Valor pronóstico de la perfusión cerebral por RM en el estudio inicial de los gliomas de alto grado / Prognostic value of brain perfusion by MRI in the initial study of high grade gliomas

Objetivos: Valorar si la perfusión tumoral en el estudio diagnóstico inicial de RM es un marcador pronóstico para la supervivencia en pacientes diagnosticados de gliomas de alto grado. Analizar los factores de riesgo que influyen en la mortalidad por gliomas de alto grado para poder cuantificar la supervivencia global esperada del paciente. Pacientes y métodos: Se seleccionaron las RM de todos los pacientes diagnosticados de glioma de alto grado en un hospital de tercer nivel entre los años 2017 y 2019. Se recogieron variables clínicas y tumorales. Se usó el análisis de supervivencia para determinar la asociación entre la perfusión tumoral y el tiempo de supervivencia. Se estudió la relación entre las variables recogidas y la supervivencia mediante el estadístico de Wald, cuantificando esta relación mediante la regresión de Cox. Por último, se analizó el tipo de relación existente entre la perfusión tumoral y la supervivencia a través del estudio de regresión lineal. Estos análisis estadísticos se realizaron con el software SPSS v.17. Resultados: Se incluyeron 38 pacientes (media de edad 61,1años). La supervivencia media global fue de 20,6meses. Se observó asociación entre la perfusión tumoral en la RM diagnóstica y la supervivencia global, mostrando el grupo con valores intratumorales de volumen sanguíneo cerebral relativo (rVSC) >3,0 una disminución significativa en el tiempo medio de supervivencia respecto al grupo con valores <3,0 (14,6meses vs 22,8meses, p=0,046). También han demostrado influir significativamente en la supervivencia media variables como la escala de Karfnosky y el tiempo de recidiva desde la intervención. Conclusiones: Se ha evidenciado que la perfusión tumoral por RM tiene valor pronóstico en el estudio inicial de los gliomas de alto grado.(AU)

Objectives: To evaluate if the tumour perfusion at the initial MRI scan is a marker of prognosis for survival in patients diagnosed with high grade gliomas (HGG). To analyse the risk factors which influence on the mortality from HGG to quantify the overall survival to be expected in patients. Patients and methods: The patients diagnosed with HGG through a MRI scan in a third-level hospital between 2017 and 2019 were selected. Clinical and tumour variables were collected. The survival analysis was used to determine the association between the tumour perfusion and the survival time. The relation between the collected variables and the survival period was assessed through Wald's statistical method, measuring the relationship via Cox's regression model. Finally, the type of relationship that exists between the tumour perfusion and the survival was analysed through the lineal regression method.Those statistical analysis were carried out using the software SPSS v.17. Results: Thirty-eight patients were included (average age: 61.1years old). The general average survival period was 20.6months. A relationship between the tumour perfusion at the MRI scan and the overall survival has been identified, in detail, a group with intratumor values of relative cerebral blood volume (rCBV) >3.0 has shown a significant decline in the average survival period with regard to the average survival period of the group with values <3.0 (14.6months vs. 22.8months, P=.046). It has also been proved that variables like Karnofsky's scale and the response time since the intervention significantly influence on the survival period. Conclusions: It has become evident that the tumour perfusion via MRI scan has a prognostic value in the initial analysis of HGG. The average survival period of patients with rCBV less than or equal to 3.0 is significantly higher than those patients whose values are higher, which allows to be more precise with the prognosis of each patient.(AU)

Seguimiento mediante angio-resonancia magnética de aneurismas cerebrales embolizados: concordancia entre lectores / MR angiography follow-up of embolized cerebral aneurysms: interobserver agreement

Objetivo: valorar el grado de concordancia entre lectores en los estudios de angio-resonancia magnética (angio-RM) realizados como seguimiento de aneurismas intracraneales embolizados. Asimismo, comprobar si el uso de contraste paramagnético mejora el grado de concordancia. Material y métodos: se recogen los estudios de angio-RM realizados desde julio de 2004 a diciembre de 2006 como seguimiento de aneurismas cerebrales embolizados. Estas exploraciones se analizaron de forma independiente por 2 neurorradiólogos con experiencia en RM. Se obtuvieron 2 secuencias para cada paciente, una sin contraste, mediante parámetros 3D time-of-flight, y otra con contraste paramagnético. Los hallazgos se dividieron en: a) invalorable; b) oclusión completa, y c) resto aneurismático. El grado de concordancia entre lectores para las angio-RM sin y con contraste se midió mediante el cálculo del coeficiente kappa y se clasificó en: k<0,2 insignificante; k=0,21–0,4 bajo; k=0,41–0,6 moderado; k=0,61–0.8 bueno, y k>0,81 excelente. Resultados: se obtuvieron 200 angio-RM, 100 realizadas sin contraste y 100 con contraste, en un total de 48 pacientes a los 6, 12 y/o 24 meses tras la embolización. El grado de concordancia entre lectores fue bueno, tanto para las angio-RM sin contraste como para las con contraste, si bien fue superior para los estudios con contraste (k=0,660, p<0,001 y k=0,779, p<0,001, respectivamente). Conclusiones: la angio-RM presenta una buena concordancia entre lectores en el seguimiento de aneurismas intracraneales embolizados. El uso de contraste paramagnético ha supuesto un mayor grado de concordancia observado (AU)

Objective: To determine the interobserver agreement in the interpretation of MR angiography (MRA) studies for surveillance of embolized intracranial aneurysms. To determine whether contrast administration improves interobserver agreement. Material and methods: Two experienced neuroradiologists independently reviewed all follow-up MRA studies performed between July 2004 and December 2006 of cerebral aneurysms embolized with coils. All MRA studies included both unenhanced 3D time-of-flight (3D TOF) and contrast-enhanced MRA (CE-MRA) images. Studies were classified as: a) not assessable; b) complete occlusion; c) residual aneurysm. Interobserver agreement for unenhanced and enhanced MRA studies was determined using the kappa statistic. Kappa values were considered insignificant when<0.2, low when between 0.21 and 0.4, and moderate when between 0.41–0.6; values >0.6 were considered good agreement and >0.8 excellent agreement. Significance was set at p<0.005. Results: We reviewed a total of 200 MRA studies (100 3D TOF studies and 100 CE-MRA studies) performed in 48 patients (25 women, 23 men) at 6, 12, and/or 24 months after embolization. Interobserver agreement was good in both 3D TOF and CE-MRA studies, although it was better in CE-MRA studies (k=0.660, p<0.001 and k=0.779, p<0.001, respectively). Conclusions: Interobserver agreement is good for follow-up MRA studies of embolized intracranial aneurysms. Gadolinium administration improves interobserver agreement (AU)

[MR angiography follow-up of embolized cerebral aneurysms: interobserver agreement]. / Seguimiento mediante angio-resonancia magnética de aneurismas cerebrales embolizados: concordancia entre lectores.

OBJECTIVE: To determine the interobserver agreement in the interpretation of MR angiography (MRA) studies for surveillance of embolized intracranial aneurysms. To determine whether contrast administration improves interobserver agreement. MATERIAL AND METHODS: Two experienced neuroradiologists independently reviewed all follow-up MRA studies performed between July 2004 and December 2006 of cerebral aneurysms embolized with coils. All MRA studies included both unenhanced 3D time-of-flight (3D TOF) and contrast-enhanced MRA (CE-MRA) images. Studies were classified as: a) not assessable; b) complete occlusion; c) residual aneurysm. Interobserver agreement for unenhanced and enhanced MRA studies was determined using the kappa statistic. Kappa values were considered insignificant when<0.2, low when between 0.21 and 0.4, and moderate when between 0.41-0.6; values >0.6 were considered good agreement and >0.8 excellent agreement. Significance was set at p<0.005. RESULTS: We reviewed a total of 200 MRA studies (100 3D TOF studies and 100 CE-MRA studies) performed in 48 patients (25 women, 23 men) at 6, 12, and/or 24 months after embolization. Interobserver agreement was good in both 3D TOF and CE-MRA studies, although it was better in CE-MRA studies (kappa=0.660, p<0.001 and kappa=0.779, p<0.001, respectively). CONCLUSIONS: Interobserver agreement is good for follow-up MRA studies of embolized intracranial aneurysms. Gadolinium administration improves interobserver agreement.

[Paralysis of cranial nerves as a form of presentation of dissection of the internal carotid artery]. / Parálisis de pares craneales bajos como forma de presentación de la disección de la arteria carótida interna.

INTRODUCTION: Dissection of the internal carotid artery (DIC) is a known cause of cerebral infarct, especially in young patients. The classical clinical syndrome consists of unilateral pain of the head or neck, homolateral oculo-sympathetic paresis and ischaemic symptoms of the cerebral hemisphere involved. Presentation as paralysis of cranial nerves is rare and occurs in less than 12% of cases. The neurological involvement seems to be due to compression caused by the increased diameter of the artery involved. CASE REPORTS: Two patients are reported with paralysis of the lower cranial nerves secondary to DIC. In the first case there was paralysis of the left cranial nerves IX, X, and XII which was diagnosed on angiography using computerized tomography with spiral acquisition. The second patient had clinical involvement of cranial nerves IX, X, XI and XII and magnetic resonance angiography showed the dissection. Both cases were confirmed after digital subtraction angiography. CONCLUSION: Diagnosis of DIC requires a high level of suspicion in cases with atypical onset. The use of new techniques of non invasive imaging diagnosis such as computerized tomography and magnetic resonance angiography permit effective diagnosis of this disorder.