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CT of a unicameral bone cyst in a rib

J. Ian Marsh, MD Peter L. Munk, MD ^* and Nestor L. Muller, MD

Department of Radiology, St Paul's Hospital, 1081 Burrard Street, Vancouver BC V6Z 1Y6, Canada Department of Radiology, University of British Columbia and Vancouver General Hospital, 1081 W. 12th Avenue, Vancouver BC V5Z 1 M9, Canada

Correspondence: ^* Address correspondence to P. L. Munk, MD, Department of Diagnostic Radiology, University Hospital, PO Box 5339, London, Ontario N6A 5A5, Canada.

This excerpt was created in the absence of an abstract.

Unicameral bone cysts are relatively common lesions in childhood but are distinctly unusual in the ribs; a single case having been reported previously (Shulman et al, 1977). They occur most frequently in the metaphysis of the proximal ends of the humerus or femur (Jaffe et al, 1942; Baker, 1970). There is an age dependency of the location of these lesions, the most common site after the age of 17 years being the pelvis and os calcis (Norman & Schiffman, 1977). The lesion shows a male predominance.

The computed tomographic (CT) appearance of unicameral bone cysts has been described infrequently. These lesions have a low attenuation value (0–20 Hounsfield Units (HU)) (Blumberg, 1981).

Key Words: Ribs • Neoplasm • CT • Unicameral (simple) bone cyst

Received for publication April 2, 1991. Revision received July 8, 1991. Accepted for publication August 10, 1991.

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