Intraosseous lipomas: A report of six cases and a review of literature.
BACKGROUND
Intraosseous lipoma is a very rare lesion, which constitutes not more than 0.1% of bone tumors. The introduction of cross-sectional imaging, especially MRI, seems to have increased the detection rate of these lesions.


METHODS
The authors presented 6 cases of intraosseous lipomas in bones of the lower extremities. All lesions were detected incidentally and presented radiographically as radiolucent lesions with sclerotic borders and internal trabeculations. One lesion caused bone expansion. CT and MRI identified fatty tissue in all lesions. Cystic degeneration was present in one lesion and dystrophic calcifications in two.


CONCLUSIONS
The radiographic appearance of intraosseous lipomas is not characteristic and requires differential diagnostics conducted for a long time. However, CT and MRI allow for a tissue-specific diagnosis. The detection of a predominant fatty component in a lesion confirms its benign character and no further diagnostic work-up is required.
1  Department of Clinical Radiology, Medical University of Warsaw, Warsaw, Poland.
Piotr
P
Palczewski
Jan
J
Swiątkowski
Marek
M
Gołębiowski
Katarzyna
K
Błasińska-Przerwa