Cerebral vasodilation and lesion patterns in stroke-like episodes of MELAS: a quantitative angiographic investigation - Song, Kwanju; Yoon, Myung Ki; Yang, Wookjin; Chang, Jun Young; Kang, Dong-Wha; Kwon, Sun U.; Kim, Bum Joon (Quantitative Imaging in Medicine and Surgery; Publish Ahead of Print, 2026)