Acquired progressive torcular dural arteriovenous fistula after subtotal resection of peritorcular meningioma.

A woman in her mid-50s who had undergone a subtotal resection of a peritorcular meningioma 3 years earlier presented with symptoms suggestive of increased intracranial pressure. A delayed diagnosis of a torcular dural arteriovenous fistula (dAVF) diagnosis was made on MRI. Digital subtraction angiography confirmed a torcular dAVF (Borden type II). Staged 3 rounds of transarterial (TA) embolisation were performed using n-butyl cyanoacrylate, ethylene vinyl alcohol copolymer and coils of the complex torcular dAVF, which significantly reduced the flow and corresponded with improved symptoms of pulsatile tinnitus, vision and headache. We reviewed previously reported cases of dAVFs that developed after craniotomy for meningioma resection. Despite its rarity, a torcular dAVF can develop after craniotomy and progress from low to high grade due to its location. Diagnosis requires a thorough understanding of subtle imaging findings, which may be present in follow-up studies obtained for tumour surveillance.