It is not possible to shrink an acoustic neuroma (vestibular schwannoma) naturally. Although some people have tried dietary or herbal interventions and other natural alternatives, there is no scientific or medical evidence to support these claims.
The best and most successful treatment for acoustic neuroma is surgical removal of the tumor. For small tumors, a gamma knife or stereotactic radiosurgery can be used. These treatments involve using radiotherapy to target and shrink the tumor. For larger tumors, or for tumors that can't be treated with gamma knife or radiosurgery, a craniotomy or surgical removal of the tumor may be necessary.
In some cases, radiation therapy and chemotherapy may be used to shrink an acoustic neuroma before attempting surgical removal. Radiation therapy may be done externally or internally, while chemotherapy uses drugs to shrink the tumor.
It is important to remember that acoustic neuroma is an unpredictable condition, so it is best to discuss all treatment options with your doctor.