0.2 sec in wave between 2 ears is significant. Treatment: a. Surgery TOC i. Middle cranial fossa approach - if tumour is small with hearing present ii. Suboccipital approach - large tumour with some hearing iii. Translabyrinthine approach -large tumour with no hearing. b. Radiosurgery < 2.5 cm c. Gamma knife surgery (form of stereo tactic radiotherapy) used in patient who refuse surgery or CI to surgery or with residual tumor. Flip">