POS0039 MRI LESIONS IN SPA: A COMPARISON WITH AGE AND SEX MATCHED PARTICIPANTS WITH NON-INFLAMMATORY BACK PAIN

Background:Magnetic resonance imaging (MRI) is becoming increasingly important in axial spondyloarthritis (SpA) due to its unique role in early diagnosis, classification, and monitoring of disease (1, 2). It is the only disease assessment tool that has been validated with histological inflammatory cellularity in tissue biopsy of the sacroiliac (SI) joint (3). However, many MRI lesions are not exclusive to axial SpA and may occur in other conditions such as infection, degeneration and malignancy. Further characterization of these lesions may guide more targeted therapies.Objectives:The objective of this study was to describe, investigate associated factors, and to compare individual MRI lesions with age and sex matched controls.Methods:This was a cross-sectional observational study of MRI lesions of 431 participants with axial SpA compared with 53 age and sex matched participants with non-inflammatory back pain. Individual lesions identified included: discovertebral lesions (DVL), facet joint lesions, costovertebral joint lesions, corner inflammatory lesions (CIL), and fatty corner lesions (FCL). Associated factors of the lesions were determined by regression analyses.Results:Compared to the control group, participants with axial SpA had more costovertebral lesions (12.5% vs 1.9%; p=0.02), CIL (46.6% vs 15.1%; p=0.03), and FCL (55.5% vs 39.6%; p=0.03). Multivariate regression showed that age (OR=1.02; p=0.03), regular alcohol use (OR=0.40; p=0.04) and radiographic axial SpA (OR=1.89; p=0.01) were associated with DVL; Chinese ethnicity (OR=0.06; p=0.01) and radiographic axial SpA (OR=3.63; p=0.01) were associated with facet joint lesion; radiographic axial SpA (OR=4.26; p<0.001) was associated with costovertebral joint lesion; male gender (ß=1.10; p=0.01), HLA B27 (ß=1.02; p=0.02), and radiographic axial SpA (ß=1.05; p=0.01) were associated with CIL; age (ß=0.10; p<0.01), male gender (ß=1.96; p=0.01), body weight (ß=0.11; p<0.01), HLA B27 (ß=3.23; p<0.001), and radiographic axial SpA (ß=1.77; p=0.02) were associated with FCL.Conclusion:The individual MRI lesions more specific to axial SpA when compared to non-inflammatory back pain were costovertebral joint lesions, CIL, and FCL.References:[1]Mandl P, Nacarro-Compan V, Terslev L, Aegerter P, van der Heijde D, D’Agpstino MA, et al. EULAR recommendations for the use of imaging in the diagnosis and management of spondyloarthritis in clinical practice. Ann Rheum Dis. 2015;74(7): 1327-39.[2]Ostergaard M, Lambert RG. Imaging in ankylosing spondylitis. Ther Adv Musculoskeletal Dis. 2012;4(4):301-11.[3]Bollow M, Fischer T, Reisshauer H, Backhaus M, Sieper J, Hamm B, et al. Quantitative analyses of sacroiliac biopsies in spondyloarthropathies: T cells and macrophages predominate in early and active sacroillitis - cellularity correlates with the degree of enhancement detected by magnetic resonance imaging. Ann Rheum Dis. 2000;59(2):135-40.Disclosure of Interests:None declared.

Interdisciplinary Radical “En-Bloc” Resection of Ewing Sarcoma of the Chest Wall and Simultaneous Chest Wall Repair Achieves Excellent Long-Term Survival in Children and Adolescents

Introduction: Ewing sarcomas of the chest wall, historically known as “Askin tumors” represent highly aggressive pediatric malignancies with a reported 5-year survival ranging only between 40 and 60% in most studies. Multimodal oncological treatment according to specific Ewing sarcoma protocols and radical “en-bloc” resection with simultaneous chest wall repair are key factors for long-term survival. However, the surgical complexity depends on tumor location and volume and potential infiltrations into lung, pericardium, diaphragm, esophagus, spine and major vessels. Thus, the question arises, which surgical specialties should join their comprehensive skills when approaching a child with Ewing sarcoma of the chest wall.Patients and Methods: All pediatric patients with Ewing sarcomas of the chest wall treated between 1990 and 2020 were analyzed focusing on complete resection, chest wall reconstruction, surgical complications according to Clavien-Dindo (CD) and survival. Patients received neo-adjuvant chemotherapy according to the respective Ewing sarcoma protocols. Depending on tumor location and organ infiltration, a multi-disciplinary surgical team was orchestrated to perform radical en-bloc resection and simultaneous chest wall repair.Results: Thirteen consecutive patients (seven boys and six girls) were included. Median age at presentation was 10.9 years (range 2.2–21 years). Neo-adjuvant chemotherapy (n = 13) and irradiation (n = 3) achieved significant reduction of the median tumor volume (305.6 vs. 44 ml, p &lt; 0.05). En-bloc resection and simultaneous chest wall reconstruction was achieved without major complications despite multi-organ involvement. Postoperatively, one patient with infiltration of the costovertebral joint and laminectomy required surgical re-intervention (CD IIIb). 11/13 patients were treated with clear resections margins (R1 resection in one patient with infiltration of the costovertebral joint and marginal resection &lt;1 mm in one child with multiple pulmonary metastases). All patients underwent postoperative chemotherapy; irradiation was performed in four children. Two deaths occurred 18 months and 7.5 years after diagnosis, respectively. Median follow-up for the remaining patients was 8.8 years (range: 0.9–30.7 years). The 5-year survival rate was 89% and the overall survival 85%.Conclusion: EWING specific oncological treatment and multi-disciplinary surgery performing radical en-bloc resections and simultaneous chest wall repair contribute to an improved survival of children with Ewing sarcoma of the chest wall.

Traumatic costovertebral joint dislocation

Rib fractures due to blunt trauma are a common chest injury seen at the emergency department; however, injuries to the costovertebral joints are very rare. We present a case of a 24-year-old man who was admitted after a high-speed car collision and was assessed in a level 1 trauma centre in Amsterdam. He had multiple injuries, including dislocation of the costovertebral joint of ribs 7–10. After performing a literature search we concluded that patients with traumatic costovertebral joint dislocations have a high incidence of vertebral fractures, neurological deficits and additional fractures. We believe that isolated dislocation of one or multiple costovertebral joint(s) can safely be treated conservatively. Close monitoring of the patients is advisable as these injuries are caused by high impact and are associated with other injuries.

Whole-spine Computed Tomography Findings in SAPHO Syndrome

Objective.We evaluated the whole-spine computed tomography (CT) findings in patients with synovitis, acne, pustulosis, hyperostosis, and osteitis (SAPHO) syndrome to improve our understanding of this rare disease.Methods.Whole-spine CT images obtained in 69 patients with SAPHO were reviewed. For each individual, a total of 25 vertebrae were evaluated for the distribution of affected vertebrae, CT manifestations of vertebral lesions, symmetry and location of distribution of the lesions on vertebrae, involvement pattern, and narrowing of adjacent intervertebral disc space. Paravertebral ligamentous ossifications, apophyseal joint disorders, and costovertebral joint disorders were also evaluated.Results.All the 69 patients with SAPHO exhibited abnormalities on whole-spine CT. Sixty-four had vertebral lesions, 52 had paravertebral ossifications, and 47 had both. The vertebral lesions were observed in 441 vertebrae, with a predilection for thoracic spine. The lesions exhibited a mixture of cortical erosion, reactive osteosclerosis of surrounding cancellous bone, and syndesmophyte. They may be confined to the vertebral corner (65.1%) or be extensive, involving the endplate (34.9%). Corner lesions could start in any part of the epiphyseal ring. The lesions were asymmetrically distributed. The affected vertebrae were more consecutively involved in a “kissing” appearance (78.2%). Intervertebral disc spaces were usually normal or mildly narrowed. There were 320 foci of paravertebral ossifications observed, with a predilection for the supraspinous ligament. Paravertebral ossifications were delicate and segmental. Ossifications throughout annulus fibrosis and apophyseal joint were not observed.Conclusion.Our investigation of the distributional, morphological features and the involvement pattern of spinal lesions in patients with SAPHO demonstrated distinct CT characteristics.