Postoperative spinal adhesive arachnoiditis presenting with hydrocephalus and cauda equina syndrome.

To our knowledge, the association between hydrocephalus and postoperative spinal adhesive arachnoiditis (SAA) has never been reported. Herein we describe an unusual case of a 45-year-old man with spinal adhesive arachnoiditis (SAA) who developed delayed-onset hypertensive hydrocephalus and cauda equina syndrome (CES) after multiple low-back surgeries. The patient's clinical presentation, imaging findings, surgical management, and the possible mechanisms are discussed in the light of the present literature.