Just got a call that my brother in law was rushed to hospital after suffering stroke-like symptoms. Docs discovered bleeding in the brain. During surgery, they discovered that the bleeding has been going on for some time. They guesstimated weeks (?) based on clotted blood present in the brain. brother in law seems to be doing fine after surgery...but will remain in hospital for a while. Question: What causes a slow leak in the brain? How can someone have bleeding in the brain without knowing for several weeks?