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The imaging crisis in axial spondyloarthritis
Torsten Diekhoff1, Denis Poddubnyy2
1Department of Radiology, Brandenburg Medical School, Rüdersdorf, Germany; Department of Radiology, Charité-Universitätsmedizin Berlin, Humboldt-Universität zu Berlin, Freie Universität Berlin, Berlin, Germany.
Abstract:
Imaging holds a pivotal yet contentious role in the early diagnosis of axial spondyloarthritis. Although MRI has enhanced our ability to detect early inflammatory changes, particularly bone marrow oedema in the sacroiliac joints, the poor specificity of this finding introduces a substantial risk of overdiagnosis. The well intentioned push by rheumatologists towards earlier intervention could inadvertently lead to the misclassification of mechanical or degenerative conditions (eg, osteitis condensans ilii) as inflammatory disease, especially in the absence of structural lesions. Diagnostic uncertainty is further fuelled by anatomical variability, sex differences, and suboptimal imaging protocols. Current strategies-such as quantifying bone marrow oedema and analysing its distribution patterns, and integrating clinical and laboratory data-offer partial guidance for avoiding overdiagnosis but fall short of resolving the core diagnostic dilemma. Emerging imaging technologies, including high-resolution sequences, quantitative MRI, radiomics, and artificial intelligence, could improve diagnostic precision, but these tools remain exploratory. This Viewpoint underscores the need for a shift in imaging approaches, recognising that although timely diagnosis and treatment is essential to prevent long-term structural damage, robust and reliable imaging criteria are also needed. Without such advances, the imaging field risks repeating past missteps seen in other rheumatological conditions.
Insights
Magnetic resonance imaging (MRI) aids early axial spondyloarthritis diagnosis but risks overdiagnosis due to poor specificity. New imaging techniques are needed for accurate diagnosis and to prevent misclassification of other conditions.
Area of Science:
- Rheumatology
- Radiology
- Medical Imaging
Background:
- Imaging, particularly MRI, is crucial for early axial spondyloarthritis (axSpA) diagnosis.
- MRI can detect bone marrow edema in sacroiliac joints, an early sign of inflammation.
- However, the low specificity of bone marrow edema leads to a significant risk of overdiagnosis.
Purpose of the Study:
- To highlight the challenges and limitations of current imaging strategies in the early diagnosis of axSpA.
- To discuss the potential of emerging imaging technologies in improving diagnostic accuracy.
- To advocate for a revised approach to imaging in axSpA to prevent misdiagnosis.
Main Methods:
- Review of current literature on imaging in axSpA diagnosis.
- Analysis of the specificity issues associated with MRI findings like bone marrow edema.
- Discussion of factors contributing to diagnostic uncertainty, including anatomical variability and suboptimal protocols.
Main Results:
- Current imaging strategies, including bone marrow edema quantification and clinical data integration, offer limited success in preventing overdiagnosis.
- Emerging technologies like high-resolution MRI, radiomics, and AI show promise but are still under investigation.
- Diagnostic uncertainty is exacerbated by anatomical variations, sex differences, and inconsistent imaging protocols.
Conclusions:
- A shift in imaging approaches is necessary to improve diagnostic precision for axSpA.
- Robust and reliable imaging criteria are essential to complement early intervention efforts.
- Failure to advance imaging standards risks repeating diagnostic errors seen in other rheumatic diseases.
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