
Is There Increased Risk Of Rebleeding While Taking An MRI Scan?

If no cause risk is very low.
Detailed Answer:
Hello and thank you for keeping in touch.
In case no cause for the bleed is found even after extensive testing then the risk of rebleeding is very low. You do not provide much information about the type of hemorrhage (subdural/subarachnoidal/parenchymal), or its location, but the risk is close of that of the general population.
However it is too early to think about that. In more than 85% of cases a cause is eventually found. At 5 weeks there may still be some blood and/or swelling and I think the MRI might not be enough to exclude it. If it comes negative I would do another MRI in 3 months and if that again is negative another Angiography at 6 months.
I am not sure what they meant by pump not working. Hopefully it was a technical difficulty of the machine as opposed to something related to your sister's anatomy such as tortuous blood vessels, which would mean a repeat angiography would be difficult as well. However it depends also on what part they failed to catheterize and image, if the hemorrhage is lateralized and they were able to do that particular side it is reassuring.

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