“ Rare (less than 0.5% of bone tumours) lesions more common from 40-50 years of age; commonly present with pain. Typically found in the meta...
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Rare (less than 0.5% of bone tumours) lesions more common from 40-50 years of age; commonly present with pain. Typically found in the metadiaphyses of the long bones, particularly the intertrochanteric/subtrochanteric femur. Rarely become malignant.
PLAIN FILM
• Lucent lesion with a thin sclerotic margin
• Occasionally lobular or intraosseous ridge
• Lucent lesion + thin sclerotic margin + central calcified nidus = intraosseous lipoma
CT
• Lesion is fat dense (-60 to -100 HU).
• Resorption of trabeculae.
MRI
• Signal characteristics of fat differentiate it from a simple bone cyst (lipoma high T1 signal, cyst high T2 signal).
• Cystic centre.
• Low signal intensity rim (sclerosis).
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