Norrie Disease: Cochlear Enhancement and Cerebellar Signal Abnormalities

Norrie disease is a rare X-linked condition characterized by early childhood blindness and later onset sensorineural hearing loss. We report two male infants with genetically confirmed Norrie disease and characteristic ocular abnormalities consisting of bilateral funnel retinal detachments, anterior segment dysgenesis, and/or buphthalmos and microphthalmia. MRI demonstrated enhancement of the cranial nerves, cochleae, and cerebellum with cerebellar restricted diffusion. Intracranial findings mimicked meningitis, labyrinthitis, and cerebellitis. Neither infant showed clinical signs of infection. Labyrinthine and cerebellar signal abnormalities have not been previously reported in the context of Norrie disease. Clinicians should consider Norrie disease when encountering such findings and be aware that the described intracranial features of Norrie disease do not necessarily indicate CNS infection.