Fig. 1From: Spinal adhesive arachnoiditis in an adult patient with spinal muscular atrophy type 3 treated with intrathecal therapy MRI of the lumbosacral spine performed on a 3T scanner, T2-weighted (A, C) and T1-weighted images after contrast administration (B, D). MR examination revealed the distorted nerve roots, adherent to the thecal sac, creating the “empty thecal sac” sign (arrow) typical for type II arachnoiditisBack to article page