Case Report: Dyke-Davidoff-Masson syndrome resulting from a rare combination of hypoplastic left posterior cerebral artery and ipsilateral fetal-type posterior communicating artery

This case identifies PCA hypoplasia with FTP as a novel DDMS etiology, challenging the MCA/ICA-centric paradigm. The "posterior phenotype" (absence seizures, preserved motor function, occipitotemporal cognitive deficits) expands DDMS heterogeneity. Multimodal imaging (angiography/perfusion) is diagnostic gold-standard, while personalized therapy optimizes outcomes.