Clinical Presentation
CNO exhibits diverse clinical presentations, ranging from mild, unifocal, and time-limited disease to severe, chronically active or recurrent multifocal bone lesions often accompanied by cutaneous manifestations and additional immune-mediated diseases [PMID:31337412].
Dedicated sagittal spinal imaging is crucial for identifying vertebral height loss, vertebra plana, and abnormal high T2W signal indicative of CNO, which can lead to scoliosis and kyphosis [PMID:40737772].
Diagnosis
Despite increased recognition, CNO often suffers from misdiagnosis and delayed treatment due to the absence of reliable diagnostic criteria and standardized management protocols [PMID:31337412].
Routine imaging techniques may underreport spinal lesions in CNO, emphasizing the importance of detailed sagittal spinal imaging to detect vertebral changes such as destruction and height loss [PMID:40737772].
MRI detected inflammatory lesions in 98.1% of symptomatic regions compared to 74.1% by Tc-99m MDP bone scintigraphy (PMID:22765947).
MRI showed 100% sensitivity for lesions in long bones of the thigh and lower legs, outperforming bone scintigraphy which had 78.4% sensitivity (PMID:22765947).
Management
Patients frequently undergo prolonged antibiotic treatment, indicative of diagnostic challenges where non-bacterial etiologies like CNO are overlooked [PMID:31337412].
Treatment with pamidronate in CNO patients can lead to significant radiological improvements, such as a bone-in-bone appearance, indicating successful stabilization and recovery of vertebral structures [PMID:40737772].
Given MRI's higher sensitivity in detecting the extent of inflammatory processes, it is recommended over bone scintigraphy for diagnosing CNO (PMID:22765947).
References
1 Skrabl-Baumgartner A, Singer P, Greimel T, Gorkiewicz G, Hermann J. Chronic non-bacterial osteomyelitis: a comparative study between children and adults. Pediatric rheumatology online journal 2019. link 2 Andronikou S, Guariento A, Zouvanni A, Yaya C, Hlabangana LT. Relevance of spinal lesions in chronic non-bacterial osteomyelitis and imaging features on whole body MRI. Clinical imaging 2025. link 3 Morbach H, Schneider P, Schwarz T, Hofmann C, Raab P, Neubauer H et al.. Comparison of magnetic resonance imaging and 99mTechnetium-labelled methylene diphosphonate bone scintigraphy in the initial assessment of chronic non-bacterial osteomyelitis of childhood and adolescents. Clinical and experimental rheumatology 2012. link
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