Tibial intraosseous lipoma

Discussion:

Intraosseous lipomas can contain varying amounts of fat, fibrous tissue, and cystic degeneration. This results in a range of radiographic manifestations. Stage 2 lesions demonstrate fat and fat necrosis, and also dystrophic calcification.

The characteristic fatty component that is isointense with fatty tissues on T1 images, occupies the periphery of the lesion. Central region which hyperintense on STIR  is suggestive of fluid, which may represent cystic degeneration.

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