Annals of Otology, Rhinology and Laryngology 1995-Oct
Mitochondrial encephalomyopathy: a rare genetic cause of sensorineural hearing loss.
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A 44-year-old man with a documented 12-year history of progressive sensorineural hearing loss developed a generalized tonic-clonic seizure followed by a visual field deficit and apraxia. Six months later he developed a peripheral neuropathy and muscle fatigue followed by a slowly progressive aphasia and cortical blindness as well as increased seizure activity. A computed tomography scan showed bilateral basal ganglion calcification. The serum lactate level was elevated at 3.4 mEq/dL. A muscle biopsy enabled the diagnosis of mitochondrial myopathy. This disorder is presented as an unusual cause of progressive sensorineural hearing loss in adults.