Wednesday, November 11, 2009

Osteoid Osteoma: MRI Appearance

On T1-weighted images (first panel from left), the nidus of osteoid osteoma is isointense to muscle. The radiolucent areas of the nidus are iso- to hyperintense on T2-weighted images (middle panel). Dynamic imaging reveals peak enhancement during the arterial phase (third panel from left) with early partial washout of the nidus. There is slower, progressive enhancement of adjacent bone marrow. Extensive bone marrow edema may be seen.


Bredella MA. StatDx.

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