PT - JOURNAL ARTICLE AU - Lu, S. AU - Brusic, A. AU - Gaillard, F. TI - Arachnoid Membranes: Crawling Back into Radiologic Consciousness AID - 10.3174/ajnr.A7309 DP - 2022 Feb 01 TA - American Journal of Neuroradiology PG - 167--175 VI - 43 IP - 2 4099 - http://www.ajnr.org/content/43/2/167.short 4100 - http://www.ajnr.org/content/43/2/167.full SO - Am. J. Neuroradiol.2022 Feb 01; 43 AB - SUMMARY: The arachnoid membranes are projections of connective tissue in the subarachnoid space that connect the arachnoid mater to the pia mater. These are underappreciated and largely unrecognized by most neuroradiologists despite being found to be increasingly important in the pathogenesis, imaging, and treatment of communicating hydrocephalus. This review aims to provide neuroradiologists with an overview of the history, embryology, histology, anatomy, and normal imaging appearance of these membranes, as well as some examples of their clinical importance.ETVendoscopic third ventriculostomyLMLiliequist membrane