Why is Brain Cancer the only type of Cancer that doesnt cause metastasis?

All types of Cancer spread to other organs and cause metastasis except Brain Cancer. Usually Cancer cells spread to the brain but not from the brain to other organs. I read that once that Brain Cancer unlike other forms of Cancer doesnt spread and I was wondering why is that? P.S. Thank goodness that it doesnt... show more All types of Cancer spread to other organs and cause metastasis except Brain Cancer. Usually Cancer cells spread to the brain but not from the brain to other organs. I read that once that Brain Cancer unlike other forms of Cancer doesnt spread and I was wondering why is that?

P.S. Thank goodness that it doesnt spread luckily by the way.
Having Cancer on one organ is bad enough let alone on more organs.
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