FIG 1. A 47-year-old man with a 4-year history of severe orthostatic headaches and tinnitus had documented low CSF opening pressures. Head MR imaging examinations showed diffuse pachymeningeal enhancement. Selected images from routine CT myelogram at the T5 (A), T6 (B), T7 (C), and T9 (D) interspaces demonstrate diffuse extrathecal contrast material (black arrows). The study lacks the temporal resolution necessary to locate the site of leak.