Chronic recurrent multifocal osteomyelitis causing optic neuropathy.

We present the case of an 8-year-old girl with chronic recurrent multifocal osteomyelitis (CRMO) involving the orbit and facial bone and causing left optic neuropathy. She presented with intermittent left periorbital swelling and a history of CRMO diagnosed 5 years earlier. Her disease responded well to adalimumab; however, delayed presentation resulted in permanent unilateral optic nerve atrophy and reduced vision. Orbital inflammatory disease is a rare manifestation of CRMO, and early recognition of the disease and treatment may prevent irreversible vision loss.