RESUMEN
Magnetic resonance imaging is a technique for the diagnosis and classification of brain tumors. Discrete compactness is a morphological feature of two-dimensional and three-dimensional objects. This measure determines the compactness of a discretized object depending on the sum of the areas of the connected voxels and has been used for understanding the morphology of nonbrain tumors. We hypothesized that regarding brain tumors, we may improve the malignancy grade classification. We analyzed the values in 20 patients with different subtypes of primary brain tumors: astrocytoma, oligodendroglioma, and glioblastoma multiforme subdivided into the contrast-enhanced and the necrotic tumor regions. The preliminary results show an inverse relationship between the compactness value and the malignancy grade of gliomas. Astrocytomas exhibit a mean of [Formula: see text], whereas oligodendrogliomas exhibit a mean of [Formula: see text]. In contrast, the contrast-enhanced region of the glioblastoma presented a mean of [Formula: see text], and the necrotic region presented a mean of [Formula: see text]. However, the volume and area of the enclosing surface did not show a relationship with the malignancy grade of the gliomas. Discrete compactness appears to be a stable characteristic between primary brain tumors of different malignancy grades, because similar values were obtained from different patients with the same type of tumor.
RESUMEN
O glioblastoma multiforme (GBM) é o tumor primário mais comum do sistema nervoso central (SNC). Em virtude do envelhecimento populacional, entre outros fatores, sua ocorrência em faixas etárias avançadas tem se mostrado crescente nas últimas décadas. Os objetivos da ressecção do GBM incluem: alívio do efeito de massa, citorredução tumoral, diagnóstico histopatológico, controle dos sintomas e melhoria nas taxas de sobrevivência. Por muito tempo acreditou-se que a idade seria fundamental na decisão pelo tratamento, embora alguns autores afirmem que a extensão da ressecção cirúrgica constitui o principal fator determinante do prognóstico, sobretudo para pacientes que foram eleitos para radioterapia e quimioterapia. A ressecção de mais de 98% do volume tumoral é capaz de interferir na sobrevivência, e ressecções menores proporcionaram sobrevivência semelhante à dos pacientes não abordados. O presente trabalho tem por objetivo realizar uma revisão da literatura atual a respeito do tratamento do GBM nos idosos, com enfoque especial na abordagem cirúrgica...
The glioblastoma multiforme (GBM) is the most common primary tumor of the central nervous system (CNS). Due to the aging population, among other factors, its occurrence in older age groups has shown increasing in recent decades. The goals of resection of GBM include: relieve mass effect, tumor debulking, histopathological diagnosis, symptom control and improvement in survival rates. For a long time it was believed that age would be crucial in deciding the treatment, although some authors state that the extent of surgical resection is the main determinant of prognosis, especially for patients who were elected to radiotherapy and chemotherapy. The resection of more than 98% of the tumor volume can interfere with the survival and minor resections provided similar to survival of patients not operated. This paper aims to review the current literature regarding the treatment of GBM in the elderly, with special focus on surgical approach...