my son just had a subdermal hematoma and surgery to drain it in a burr hole.  This is a complication of a large brain tumor removed two months ago, a dermoid cyst behind his eye.  He is a 16 year alcoholic and I wonder what this means for recurrence. What is  his probable prognosis of further debilitation in memory and balance?
I read your question and I understand your concern. Whether the hematoma has left any added residual damage though depends on factors like its size and compression effect and on how early it was detected and evacuated. The smaller the size and the sooner it was intervened the better the chances of no aftermath. Also, it depends on whether there is still bleeding, you mention he is alcoholic and if he has severe renal impairment from alcohol coagulation is affected as well. Generally speaking the chances are good though, I can't speak about his brain tumor, but he has good chances not to have had consequences of the hemorrhage. I hope to have been of help.