Thirty patients over the age of 10 years, exhibiting cutaneous manifestations on the back suspected to be due to spinal dysraphism, and neurologic deficits, were studied to analyze neurologic appearance. Neurologic deficits appeared by age 5 in 26 patients. No patient complained of low-back pain or sciatica. Paralytic deformities of the lower extremities were divided into four grades for evaluation: A = no deformity, with only urinary disturbance (four cases); B = toe-limited deformity (two cases); C = toe and foot-limited deformity (six cases); D = toe, foot, ankle, and lower limb deformity (18 cases). Patients with slight neurologic disturbance, either Grade A or without urinary disturbance, were seen among the patients who had undergone a release operation by age 2, although neurologic appearance in patients in severe grades was not related to the age at release operation. Also, the release operation was thought to be effective in preventing low-back pain or sciatica.