Fig. 6.
Cervical, thoracic, lumbar, and sacral histopathology from a polyethylene and a polyurethane animal. Representative cervical (A), thoracic (B), lumbar (catheter tip level) (C), and sacral (below catheter tip) (D), hematoxylin and eosin–stained sections from an animal prepared with a polyethylene catheter and harvested at 14 days. Representative cervical (E), thoracic (F), lumbar (catheter tip level) (G), and sacral (below catheter tip) (H), hematoxylin and eosin–stained sections from an animal prepared with a polyurethane catheter and harvested at 14 days. No intrathecal infusion was performed. *Catheter profile. Note indentation of parenchyma and more robust pericatheter fibrosis in polyethylene animal (A to D).