Characteristics of pial brain arteriovenous malformations with transdural arterial supply

PURPOSE Transdural blood supply (TDBS) to pial brain arteriovenous malformations (BAVM) is uncommon and believed to be related to vascular endothelial growth factor - induced angiogenesis. The aim of this study was to define the BAVM characteristics in relation to presence and volume of TDBS. METHODS BAVMs managed at our institution between January 2006 and December 2016 who subsequently underwent complete digital subtraction angiography (DSA) were included. They were classified based on presence of TDBS as well as volume of TDBS. RESULTS Of the 641 BAVM patients managed during the recruitment period, 387 (391 BAVMs) had complete pretreatment DSAs. Forty-three (11.0 %, 10 ruptured) BAVMs exhibited TDBS. With TDBS group had a significantly greater proportion of large nidus (> 3.1 cm) than the Without TDBS group (85.1 % vs 19.5 %, p < 0.01) and were more frequently temporal (32.6 % vs 14.7 %, p < 0.01) and occipital (25.6 % vs 13.5 %, p < 0.05) in location. In unruptured BAVMs, the presence of headaches was significantly more prevalent when the malformation harboured TDBS compared to not (57.6 vs 34.8 %, p < 0.05). The annual rupture rate among unruptured BAVMs treated by conservative management was 4.7 % in the With TDBS (n = 12) group and 0% (n = 21) in BAVMs with TDBS that underwent treatment including surgery, endovascular therapy, or radiosurgery. CONCLUSION BAVMs with TDBS are more likely to be associated with a large nidus and located in the temporal and occipital lobes. Headache is more frequently associated with the presence of TDBS. Rupture rate of unruptured BAVMS with TDBS can be effectively reduced following treatment.