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Comprehensive evaluation of juvenile idiopathic arthritis using whole-body MRI: a prospective cross-sectional
Mariam Said ElMedany1, Mohamed S Barakat2, Ali A Farahat2
1Department of Radiodiagnosis, Faculty of Medicine, Alexandria University, Alexandria, Egypt. mariamelmedany@gmail.com.
Insights
Non-contrast whole-body MRI effectively detects inflammation in pediatric juvenile idiopathic arthritis (JIA), guiding treatment decisions. This sensitive imaging tool identifies both clinical and subclinical disease activity, improving patient care.
Area of Science:
- Pediatric Rheumatology
- Medical Imaging
- Inflammatory Diseases
Background:
- Juvenile idiopathic arthritis (JIA) is a common childhood rheumatic disease.
- Accurate assessment of disease activity, including subclinical inflammation, is crucial for effective management.
- Current imaging modalities may have limitations in comprehensively evaluating JIA activity.
Purpose of the Study:
- To evaluate the utility of non-contrast whole-body magnetic resonance imaging (WBMRI) in detecting clinical and subclinical inflammation in pediatric JIA patients.
- To assess the impact of WBMRI findings on treatment decisions.
- To determine the sensitivity and specificity of WBMRI for JIA assessment.
Main Methods:
- Prospective cross-sectional study of pediatric JIA patients.
- Whole-body MRI using STIR sequences to assess peripheral and axial joints and entheses.
- Correlation of imaging findings with clinical and laboratory markers of inflammation.
Main Results:
- WBMRI detected radiological activity in 77.5% of patients, with peripheral joints most commonly affected.
- Subclinical inflammation was identified in 81.8% of clinically inactive patients.
- Imaging findings led to treatment modification in 50% of cases, highlighting WBMRI's clinical impact.
Conclusions:
- Non-contrast WBMRI is a sensitive tool for detecting both clinical and subclinical inflammation in JIA.
- WBMRI provides a comprehensive assessment of disease activity, aiding therapeutic decisions.
- This imaging technique avoids contrast-related risks, offering a safer alternative for pediatric patients.
Objectives:
To evaluate the role of whole-body magnetic resonance imaging (WBMRI) using a noninvasive, non-contrast protocol in detecting clinical and subclinical inflammation in pediatric patients with juvenile idiopathic arthritis (JIA) and to assess its impact on treatment decisions.
Methods:
This prospective cross-sectional study included pediatric patients diagnosed with JIA according to ILAR criteria. All participants underwent WBMRI using STIR sequences to assess peripheral and axial joints and entheses. Clinical and laboratory data, including ESR, CRP, ANA, RF, and HLA-B27, were collected for correlation with imaging findings. Two experienced musculoskeletal radiologists independently reviewed the images. Sensitivity, specificity, predictive values, and diagnostic accuracy were calculated.
Results:
Forty patients (27 females, 13 males; mean age 11.7 ± 2.6 years) were enrolled. Clinically active disease was present in 72.5%. Subclinical inflammation was identified in 81.8% of clinically inactive patients. Overall, radiological activity was detected in 77.5%, predominantly in peripheral joints (83.7%), with joint effusion being the most frequent finding (34.2%). Sacroiliitis and enthesitis were detected in 12.5% and 10%, respectively. WBMRI demonstrated a sensitivity of 75.9%, and imaging findings led to treatment modification in 50% of cases.
Conclusions:
Non-contrast WBMRI is a sensitive tool for detecting clinical and subclinical inflammation in JIA. Although specificity is relatively low, its comprehensive whole-body assessment supports its value in evaluating disease activity and guiding therapeutic decisions while avoiding contrast-related risks.
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