The posterior epidural space is largest at the level of the disc.
Aldrete
J Antonio
JA
D000767:Anesthesia, Epidural / Q000009:adverse effects* / Q000295:instrumentation; D004824:Epidural Space / Q000473:pathology*; D006801:Humans; D007403:Intervertebral Disc / Q000473:pathology; D008159:Lumbar Vertebrae / Q000473:pathology; D008279:Magnetic Resonance Imaging; D010292:Paresthesia / Q000209:etiology*; D013116:Spinal Cord / Q000473:pathology*; D013119:Spinal Cord Injuries / Q000209:etiology*; D014057:Tomography, X-Ray Computed