title: Failure of spinal anesthesia due to subdural catheter placement.
mesh_terms: D000368:Aged; D000775:Anesthesia, Spinal; D002404:Catheterization / Q000009:adverse effects*; D006801:Humans; D008297:Male; D011860:Radiography, Abdominal; D013355:Subdural Space; D013748:Tetracaine
chemical_list: D013748:Tetracaine