Abstract
Aneurysmal Bone Cyst (ABC)
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Nonneoplastic, reactive, multicystic and expansile lesion of the orbit.
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May follow trauma or arteriovenous anomalies of the bone cortex.
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Orbital roof is most commonly involved.
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CT scans show a multiloculated expansile, interdiploic lesion with cortical remodeling.
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Peripheral capsule and internal septations of the lesion are usually enhanced.
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MRI usually depicts a multiloculated isointense lesion on SE/T1, with areas of hyperintensity and high signal intensity on T2-weighted imaging. Fluid levels with heterogeneous signal intensities are the classic appearance, depending upon the state of the included blood.
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Some parts of the lesion may appear densely enhanced with contrast media.
Ewing Sarcoma
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Poorly circumscribed, heterogeneous lesion typically originating from bony wall of the orbit, most commonly the roof
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Osteolytic with mottled “moth-eaten” appearance due to erosion and destruction of bone [1]
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Associated soft tissue component may be present
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Patchy hypodense areas can indicate old hemorrhage and necrosis [2]
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Hypo- to isointense on T1-weighted MR imaging
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Heterogeneously high signal on T2-weighted imaging
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Heterogeneously contrast-enhancing on CT/MR imaging
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Diniz, S.B., Cohen, L.M., Goldberg, R.A. (2021). Aneurysmal Bone Cyst and Ewing Sarcoma of the Orbit. In: Ben Simon, G., Greenberg, G., Prat, D. (eds) Atlas of Orbital Imaging . Springer, Cham. https://doi.org/10.1007/978-3-030-41927-1_48-1
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DOI: https://doi.org/10.1007/978-3-030-41927-1_48-1
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