Hydatid disease is an infestation by the larval stages of Echinococcus granulosus. In man, the liver and lungs are the organs most frequently involved. In the spinal column, hydatid disease usually begins in the vertebral body. Extension into the spinal canal results in spinal cord compression. Intradural hydatid cyst is extremely rare compared with the other types of spinal hydatid lesions (Rayport et al, 1964; Ley & Marti, 1970; Pamir et al, 1984).
A 6-year-old boy was admitted to hospital because of progressive paraplegia, which had started 2 months previously. He was said to have lost bladder and bowel control in the last few weeks. Physical examination revealed marked reduction in the motor power of the lower limbs. There was bilateral clonus, a positive Babinski's sign and hyperactivity of the deep tendon reflexes at the lower extremities.