This dataset is a brain tumor MRI segmentation and classification dataset, which aims to provide high-quality data support for medical imaging analysis of brain tumors and is suitable for brain tumor segmentation and classification tasks. The data contains about 5,000 MRI slices, including:

• No Tumor: About 1,200 cases
• Glioma: approximately 1,300 cases
• Meningioma: approximately 1,250 cases
• Pituitary tumor: about 1,250 cases
• Data with segmentation mask: about 2,700 cases