We report a case of long-term (about 10 years) limited mouth opening following a bilateral transtemporal approach for multiple cerebral aneurysms. A 41-year-old man with limited mouth opening was referred to our clinic for treatment. At the first visit, his maximum mouth opening distance was 13 mm between the upper and lower incisors and there were palpable indurations at the bilateral temporal muscles. We diagnosed this situation as a contracture of muscles, and performed bilateral coronoidectomy under general anesthesia. Mouth-opening exercises were started from one day postoperatively, and continued for 7 months. His maximum range of mouth opening is now maintained at 30 mm.
