How can a NP specialize in otology, neurotology, or otoneurology?

[Inspired By Silence]

Are there programs that provide credentials so an RN or an APN can specialize in otology, neurotology, or otoneurology? I'm not as interested in the nose or throat as I am soley of the ear. Not that I wouldn't mind getting an otorhinolaryngology or otolaryngology (as it is usually called now) certificate if there are such certifications available for clinical nurse specialists and nurse practitioners or just a post RN certificate. I'm also interested in the neuro and brain specialties of the hearing system in general.

Is there a way that a future Deaf RN could focus soley on treating the perioperative Deaf patient? It's simply a calling...

I'd like to know how I can obtain such specialties and where.