A 33-year-old man with an unruptured right-occipital AVM underwent surgical treatment (Figures and ). Intraprocedural delay mapping provided a detailed color-coded image after opening of the dura (Figures and ); and the location of the nidus and main feeders was visualized. Based on the findings, we occluded the feeders and achieved complete removal of the AVM with accurate dissection plane between the nidus and normal brain tissue.
A 51-year-old woman who experienced massive intraventricular hemorrhage due to presence of a post-central parasagittal AVM, Spetzler & Martin grade 3, underwent surgery (Figures and ). In this case, we performed right frontoparietal craniotomy and approached the AVM via right interhemispheric route (). However, through the delay map, visualization of the precise structure of the AVM was not possible due to depth of the nidus and angle of the surgical approach (); moreover, due to swelling of the brain, exposure of the AVM was unstable.