During the last years the advances of neurosurgery and urology have completely changes the prognosis of children with myelomeningocele. To the orthopedic surgeons these patients represent a great challenge in order to correct lower limb deformities, these children have a high incidence of leg fractures. some of the fractures show an unusual pattern of repair, characterized by healing with excessive callus formation which can be confused with tumor, osteomyelitis or other diseases of the bone.