We report a case of occipital arteriovenous malformation (AVM) rupture during anaesthesia, causing post-operative visual loss in a 43-year-old man with American Society of Anesthesiologist class I. He was scheduled for an operation for the correction of right index deformity. He was a healthy, middle-sized man without any previous systemic disease. He had sustained a cutting injury to the right index finger 1 year ago and had undergone microsurgery. As he was unsatisfied with the surgical results, he was arranged for another correction surgery. After the 2-h surgery, he recovered from anaesthesia, but complained of a mild headache over the occipital region. He left the post-operative recovery room thereafter and was discharged the next day. Three days later, he came to our surgical outpatient department for follow-up. He complained of blurred vision since the surgery. The ophthalmologist found left-sided homonymous visual field loss with incomplete hemianopia. He was referred to the neurological section and after a series of examinations including brain computed tomography, the diagnosis of AVM rupture in the right occipital region was confirmed.
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