 MRI T-L-spine, 5/24/97, revealed a 6 x 8 x 25 soft tissue mass at the L1 level posterior to the tip of the conus medullaris and extending into the canal below that level. This appeared to be intradural. There was mild enhancement. There was more enhancement along the distal cord surface and cauda equina. The distal cord had sign of diffuse edema. She underwent exploratory and decompressive laminectomy on 5/27/97, and was retreated with a one day course of Praziquantel 40mg/kg/day. Praziquantel is reportedly only 80% effective at parasite eradication.