Fig. 8
From: Intruding implements: a pictorial review of retained surgical foreign objects in neuroradiology
Lipiodol-induced adhesive arachnoiditis. Sagittal unenhanced CT (a), T1-weighted (b), T2-weighted (c), and STIR-weighted (d) images showing a mass in the spinal canal at the level of L5-S1 encasing the corresponding nerve roots. It appears hyperdense on CT and hyperintense on both T1- and T2-weighted sequences with signal suppression on STIR (arrows). The cauda nerve roots appear adherent to each other, consistent with the diagnosis of arachnoiditis