My tumor is almost the identical size to yours at 1.6 cm x 1.2 cm. My first MRI was January, 2017 when I was diagnosed with an acoustic neuroma. Loss of hearing, ringing in the ear, pressure and headaches. I am also in the Watch and Wait group. I took another MRI today in order to see if the thing is growing or stable. My neurosurgeon said that if the tumor is stable and not growing, we will go another 6 months and do another MRI. If not, I will probably go for Gamma Knife radiation due to my age (66) and other medical conditions. Since our tumors are small, we have time to consider all of the options available to us. Most acoustic neuromas grow very slowly, so hopefully we are both in that situation. Best of luck.