Hi, I had gone through your question and understand your concerns. Acuostic neuroma is a benign tumor arising from nerve sheath of VIII- th cranial nerve occurring commonly at cerebello-pontine angle, vestibular neuritis is viral infection of the VIII-th nerve. Both have similar symptoms( disfunction of VIII-th nerve) but acoustic neuroma has also symptoms related to mass effect on brain structures. They are easely distinguishable on MR imaging (diffusion restriction signal in vestibular neuritis, acoustic neuroma grows into cerebello-pontine angle and is definitely bigger than the swelling of the nerve etc.) Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions.