I had mri of skull in 2011. said it was epidermoid, but could not exclude possiblity of chordoma or chondrosarcoma. six months later (2012) follow-up mri..no overall changes. i have ear fullness now, but no other symptoms. should i get a new mri now?

Visit your Doctor: I am questioning your prior diagnosis. So I would recommend that you seek a medical examination from your family/PCP doctor. let your doctor decide if you need further tests depending on your medical/clinical examination first. Such a long period(8 years) without any serious symptoms is unlike a serious diagnosis such as Chordoma.