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November 2003
By Theodore E . Keats, MD
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This 20-year-old man complains of pain in his forearm
of several months' duration. What is your interpretation
of the frontal and lateral projections of his forearm?
CLICK HERE FOR ANSWER
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ANSWER
The correct diagnosis is aneurysmal bone cyst. This
lesion is commonly seen in young patients. In its typical
presentation, as in this case, it appears as an eccentric
cystic lesion with a thin rim of expanded bone; hence
its name. The nature of this lesion is controversial,
but it is generally regarded as non-neoplastic. Treatment
is surgical.
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This series of diagnostic quizzes that
challenge your ability to read a variety of x-ray films is
edited by Dr. Keats, professor of radiology and professor
of orthopedics at the University of Virginia School of Medicine
in Charlottesville.
Emerg Med 35(11):69, 2003
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