Finally outstanding cure for acoustic neuroma was found

You are about to learn! This article will reveal!!!

  • The most safe and reliable curative surgery for acoustic neuroma to date is now available, providing a faster cure than ever before.

  • The greatest discovery of the past 40 years in the field of acoustic neuroma treatment.

Now Nakatomi’s new monitoring-based minimally invasive (MBMI) acoustic neuroma surgery (ANS) is revealed.

As the brain and nerves are subjected to a certain amount of stress or damage even over a short period of time, and they have no capacity for regeneration, they start to show a loss of electrical activity, a loss of function, and eventual cell death.

No reliable continuous neuronal indicators have previously been available during surgery, thus it was very difficult to maintain nerve functions in every circumstance.

Now, for the first time ever, a new procedure MBMI-ANS provides reliable intraoperative neuronal indicators for both facial nerve and cochlear nerve functions.

*Point 1. How we preserve excellent facial nerve function?

In order to maintain facial nerve function, we have created a stable and safe micro-electronic stimulator for the origin of facial nerves.

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By using this new invention to stimulate the origin of facial nerves continuously, surgeons can record the electromyographic responses of facial muscles moment by moment.

Using continuous facial nerve electromyography (CF-EMG), surgeon can clearly determine the maximal facial nerve response before removing a tumor, thus he can clearly understand how many % of facial nerve functions are maintained in every second.

Throughout our 3.5 years of using this surgical strategy, we have found a clear correlation between the ratio of final / initial CF-EMG amplitudes and the actual facial nerve function immediately after the operation.

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By maintaining a ratio of final /initial CF-EMG amplitudes of more than 65%, we have achieved no significant facial paralysis immediately after the operation in all cases.

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*Point 2 How we preserve effective hearing?

In order to preserve the hearing, we have invented a new cochlear nerve-monitoring approach.

The details are confidential at present; however, by using both the ABR and our new cochlear nerve-monitoring approach (we call it DNAP), we have achieved an effective hearing preservation rate of more than 80% and any measurable hearing preservation rate, 90%) during the past 3.5 years, compared with 50–60% for conventional procedures.

Furthermore, the performance of the new procedure is improving day by day.

This approach allows the hearing function to be preserved, whereas with traditional surgical procedures a loss of hearing is inevitable — that is, hearing loss is often necessary in order to remove the acoustic neuroma.

In general, the ABR evoked potential is recorded as a kind of electroencephalogram created by applying a continuous clicking sound to the ear. This is the only type of intraoperative monitoring that is currently available worldwide.

As long as we can maintain the specific wave interval change (that is, the interval between wave I and wave V) within 0.8 ms, we should be able to preserve the hearing at the same level.

There are two major disadvantages with ABR monitoring. First, it takes at least 1 minute, and thus often fails to detect the most immediate injury to the cochlear nerve.

Second, it tends to be influenced strongly by many kinds of surgical actions (coagulation, drilling, water irrigation, and so forth).

Thus, there has been a strong need for more reliable, real-time cochlear nerve monitoring over the years.

We have succeeded in inventing such a system (we called it DNAP)and have verified its efficacy through surgical application over the past 3.5 years.

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This is the greatest discovery of the past 40 years in the field of acoustic neuroma treatment!

*Point 3 How MBMI surgery is different from conventional surgery?

Here is the comparison between conventional surgery and Nakatomi’s MBMI surgery. There are so many advantages in this new method. Please take a moment to review this table too.


Conventional surgery

Nakatomi’s MBMI surgery

Hearing loss

Loss of hearing is necessary, or at least hearing preservation is not a realistic goal, for most patients in order to remove the tumor.

Hearing preservation rate is remarkably improved while ear function is not compromised.

Facial paralysis and invasiveness

Often highly invasive with regard to nerve function. Long-term rehabilitation for at least 3–12 months can be required to regain facial movement.

Non-invasive or minimally invasive with regard to nerve function. MBMI surgery allows safer, faster, and more satisfactory recovery of facial movement.

Average hospital stay

10–14 days

7–10 days

Average cost (US$)




Often lower than expected


*Point 4. We recommend our MBMI surgery for all the patients having acoustic neuroma unless you have specific medical conditions.

Based on the evidence of large volume studies of each treatment and in accordance with your individual medical requirements, we will recommend the best treatment for you.

Hence, depending on the tumor size, and in order to achieve the optimal functional preservation, the primary role of surgery can differ from patient to patient.

To maintain the best facial nerve function and the best hearing function, we recommend our MBMI-ANS as a primary treatment. In this way, we will achieve the best long-term outcome for you.