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Clear bare window observed in (A) supine position magnetic resonance imaging and (B) lateral decubitus with minimal change in size of L5/S1 disk by position. ASBS & ALBL, L5/S1 bare window; OSPSBS & OLPBL’, oblique angle; AS & AL, right common iliac vein; BS & BL, left common iliac vein; OS & OL, center of L5/S1 disk; PS & PL, posterior disk midpoint.
