[Osteoporosis and complications in hearing implants. Analysis of two cases].

We present the case of a premature female patient, carrier of profound bilateral congenital sensorineural hearing loss. At 16 months a Nucleus Contour Advance was implanted in the right ear using posterior tympanotomy with opening of the facial recess and minimum drilling of the back wall of the external auditory canal (EAC). At the second year of evolution cholesteatoma became evident in the EAC, entering the mastoid bone through its posterior wall. The patient was operated on again, cleaning mastoid cavity and reinforcing the back wall of the EAC with cartilage from the tragus. She was admitted to the hospital at 5 months’ postoperative for metabolic decompensation; the diagnosis was nephropathy with loss of potassium and calcium and secondary osteoporosis (Bartter syndrome). After 2 years of follow-up and treatment of her nephropathy, there has been no recurrence of cholesteatoma.