My balance was bad pre-op, especially with head movement. Standing with my feet next to each other, crossing my arms across my chest, and then closing my eyes ( a standard balance test ) lead to swaying immediately.
The doctors I consulted both estimated my tumor had been growing for 15 to 20 years to reach almost 5 cm in size. Both doctors also believed I had probably compensated already and would not experience balance issues after surgery.
I did have balance problems for the first 4 weeks I was up and walking, but it resolved over a 4 week period and improved each week. My balance will never be what it once was when I was younger ( I am 65 ) but is fine right now.
I did have to walk outside with repeating head movements - 45 degrees right, then left, up and down - to feel better balanced. I also walked inside (close to a wall) in a figure 8 pattern until it made me lightheaded. I did it 3 times a day, morning, afternoon, and evening. Soon it stopped making me feel unbalanced. I found these exercises on YouTube and the videos were from University of Michigan physical therapy.