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Orbital histiocytosis on computed tomography

  • M. Banna
    Correspondence
    Address reprint requests to: M. Banna, MD, Department of Radiology, McMaster University Medical Centre, 1200 Main Street West, Hamilton, Ontario L8N 3Z5, Canada.
    Affiliations
    Department of Radiology, McMaster University Medical Centre, Hamilton, Ontario L8N 3Z5, Canada
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  • P.Segun Olutola
    Affiliations
    Department of Radiology, McMaster University Medical Centre, Hamilton, Ontario L8N 3Z5, Canada
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      Abstract

      Computed tomography (CT) findings in two patients with orbital histiocytosis are described. The main features are (a) replacement of bone by soft tissue, which has an absorption value of approximately 40 Hounsfield units (HU) and is not contrast-medium enhanced; (b) bone expansion at the rim of the lesion; (c) a large intraosseous component and a small extraosseous part; and (d) absence of calcification or periosteal reaction.

      Keywords

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