FLOW 800 is software for analytical colour visualisation and objective evaluation of fluorescence video obtained by microscope-integrated intraoperative indocyanine green fluorescence angiography. A 56-year-old male underwent surgical excision of a large complex arteriovenous malformation (AVM) of the right parietal region. FLOW 800 software was used to identify feeding arteries, arterialised veins and passing vessels. Complete excision of the AVM was achieved, confirmed by FLOW 800 and postoperative digital subtraction angiography. The role of FLOW 800, its applications and limitations in AVM surgery are discussed.
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