Progressive subcortical calcifications secondary to venous hypertension in an intracranial dural arteriovenous fistula.

•Establishing the diagnosis of a dural arteriovenous fistula (dAVF) can be challenging.•The most commonly reported findings on CT of a dAVF are haemorrhage and focal oedema.•We describe a case of progressive subcortical calcifications on CT from a high grade dAVF.•The calcifications are likely due to impaired cerebral perfusion from cortical venous reflux.•Whilst not pathognomonic, such calcifications should raise the possibility of a dAVF.