[Cochlear implantation through the middle fossa approach]

Area of Science:

• Otolaryngology
• Neurosurgery
• Audiology

Background:

• Traditional cochlear implantation involves insertion through the mastoid and middle ear.
• This classical method is unsuitable for patients with chronic otitis media or middle ear malformations.
• The middle fossa approach, proposed by Colletti, bypasses middle ear structures for cochlear implant insertion.

Observation:

• A patient with bilateral chronic otitis media, who had undergone multiple unsuccessful ear surgeries, was selected for cochlear implantation.
• The middle fossa approach was utilized, involving surgical access through the temporal lobe to expose the petrous pyramid.
• Key anatomical landmarks, including the greater superficial petrosal nerve, facial nerve, and arcuate eminence, were identified to locate the cochlea.

Findings:

• Cochlear implantation was successfully performed via the middle fossa approach, with electrode insertion into the basal turn of the cochlea.
• The patient achieved significant positive outcomes in postoperative speech rehabilitation.
• This case supports Colletti's hypothesis that deeper electrode insertion via the middle fossa approach enhances the utilization of low and middle frequencies essential for speech comprehension.

Implications:

• The middle fossa approach represents a crucial advancement for cochlear implantation in complex otological cases.
• This technique expands the candidacy for cochlear implants, offering improved hearing outcomes for patients with challenging middle ear conditions.
• Further research into optimizing electrode placement and surgical techniques within the middle fossa approach may lead to even greater speech perception improvements.