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The majority of malignant brain tumours are gliomas, a kind of central nervous system (CNS) tumour. This paper proposes segmentation based Gliomas analysis from nervous system using U- VGG-19 Net CNN architecture. Here by segmenting the tumor by neural network based technique, the HGGs will be detected at the earliest. We compared the models' averaged accuracy, precision, recall, and F1-score values, which were 98%, 96%, and 86.2% respectively. The classification of gliomas into LGG and HGG using the proposed custom model has demonstrated effectiveness and robustness in the results.