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Yes, the area can be cauterized. Most small bladder tumors are removed through a cystoscope, but it is also possible to perform cauterization through a cystoscope.
It is likely that they cauterized the base at the time of the tumor removal, but it may have been less effective because of the blood thinner, and they are trying to see if it will heal without having to do another procedure. However, if the bleeding persists, then doing another procedure is an option.
You should contact the Urologist that performed the tumor removal and ask whether it would be appropriate to consider another procedure at this point, or if it is preferred to wait, how long before another procedure would be considered.
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