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Diastematomyelia is a rare condition. It has to be taken into consideration when dealing with a congenital scoliosis. The first step in the surgical procedure has to be the resection of the diastematomyelic septum. In case of a scoliosis ranging up to 30° and not presenting a progressive potential, the expectative-evaluation attitude is a correct one.

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The purpose of this paper is to evaluate the postoperative results in paediatric patients with osteoid osteoma. We present a retrospective study including 16 patients under 18 years old treated surgically in our institution between April 2019 and September 2020. Patient demographic data, clinical aspects and imaging studies used to establish the diagnosis, lesion location, the size of the nidus, surgical data, hospitalization periods, complications and particular conditions were noted.Sixteen patients with mean age of 11.19 years (between 5 and 17 years) were treated using surgical excision (open or minimal invasive) or radiofrequency ablation (RFA). All patients presented with night pain highly responsive to nonsteroidal anti-inflammatory drugs. Imaging studies before surgery included radiographs, CT scans and/or MRI, technetium-99 bone scans. Interval between symptoms onset and surgery varied from 3 to 18 months (mean 8.18 months). Eight patients were treated using radiofrequency ablation under fluoroscopy, 5 cases were treated using minimal invasive surgery (resection-biopsy with trocar) and 3 cases were treated by open surgical excision. We have obtained histopathologic diagnosis in all cases. One patient had a superficial wound infection and two patients presented recurrent pain. In 13 patients the pain disappeared during the first 48 hours after surgery. Mean follow-up time was 10.12 months.RFA is the treatment of choice in paediatric cases of osteoid osteoma. Vicinity of important anatomical structure are contraindications for RFA. Using ablation probes with cooled tips may result in more predictable outcomes. The tendency to use less and less invasive procedures in the surgical fields seems to lead to development of non-invasive procedure.