article 2019 Cyclic Sciatica: Presentation of a Case With Intra and Extrapelvic Endometriosis Affecting the Sciatic Nerve and Utility of MR Neurography (P3.4-026) ·doi:10.1212/wnl.92.15_supplement.p3.4-026 To raise awareness about the diagnostic value of both cyclic sciatica and the use of MRN for the diagnosis of endometriosis involving peripheral nerves.