Talk to Neuro Physician on Slight Size Increased In Biletral Tumours After SRS

Doctor, I want to understand my latest scan results of biletral benign brain tumour Can you please explain what these size changes mean? Before SRS surgery, my tumors were 20×16×13 mm (right) and 15×13×11 mm (left). Now after 7 months, they are 18×19×13 mm on right and 17×15×11 mm on Left Is this considered stable or growing? Could this be swelling instead of real growth? Should I be concerned about the increase? What symptoms should I watch for? When should I come for the next scan?