Hi, Thanks for writing in. Since it has been just over a year after your meningioma surgery, your brain (cerebellum) might just be getting used to maintaining regular functions including that of balance which is one of the main functions of the cerebellum. I consider your symptoms mostly due to the continuing healing process. You may report this to your doctor and he might ask for another brain scan to be done if your symptoms are worsening or if felt necessary. As you have a history of labyrinthitis, taking medications under medical supervision would helps you. Hope this helps.