Hi Safi,

Did you check Kaggle?

If so you can try the BRATS database: http://braintumorsegmentation.org/

If all else fails, try the cancer imaging archive: https://www.cancerimagingarchive.net/

Best of luck

check out this https://www.datasetlist.com/

For brain MRI Images you may consider this dataset.

http://www.med.harvard.edu/AANLIB/