Abstract
Background
While typical patterns of osteoid osteoma have been described on CT, MRI findings can overlap among different diseases, and atypical patterns exist. In this study, we assessed the presence of a novel dark rim sign and its utility in the MRI diagnosis of osteoid osteoma.
Objective
The purpose of this retrospective study was to assess the utility of the dark rim sign seen on MRI in children with osteoid osteoma.
Materials and methods
MRI studies from 36 pediatric patients with osteoid osteoma and a control group of patients with either osteomyelitis or stress fracture were analyzed and then compared for the presence of the dark rim sign. Patients from the osteoid osteoma group were further divided based on nidus location and evaluated for the presence of the dark rim sign.
Results
The relationship between the dark rim sign and osteoid osteoma was statistically significant (P<0.001). A dark rim sign was identified in 25 of the 36 patients with osteoid osteoma. None of the control patients had a dark rim sign. The dark rim sign had 69.4% sensitivity, 100% specificity, 100% positive predictive value and 72.5% negative predictive value for detecting osteoid osteoma. The relationship between dark rim sign and nidus location was statistically significant (P<0.001) such that endosteal and medullary osteoid osteomas were more likely to have a dark rim sign than intracortical osteoid osteomas.
Conclusion
When the nidus of an osteoid osteoma is in an endosteal or medullary location, the dark rim sign may aid in the diagnosis.
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French, J., Epelman, M., Jaramillo, D. et al. Magnetic resonance imaging evaluation of osteoid osteoma: utility of the dark rim sign. Pediatr Radiol 50, 1742–1750 (2020). https://doi.org/10.1007/s00247-020-04780-4
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DOI: https://doi.org/10.1007/s00247-020-04780-4