Cerebral cyst formation in pregnancy following gamma knife surgery of an underlying arteriovenous malformation.

Cyst formation following gamma knife surgery for arteriovenous malformation (AVM) is a rare, but well-documented complication. We present a case of a 26-year old lady who underwent gamma knife surgery for an underlying AVM. Subsequently, 11 months later she developed a symptomatic cerebral cyst, whilst pregnant, presenting a challenging management dilemma.