  Case of the Week - Patient Summary 3838Peer Reviewed and Certified - | |
| Demographics: 13 y.o. Male | |
| History & Chief complaint: | |
| Left femoral pain. | |
| Physical exam: Not Available | |
| Summary of Findings: | |
| AP and Lateral of the left femur demonstrates an eccentric, cortically based lesion which is geographic with sclerotic borders and narrow zone of transition. The matrix has a lytic, ground glass appearance. There is endosteal scalloping and mild periosteal thickening. | |
| Differential Diagnosis: | |
| Non-Ossifying Fibroma
Fibrous Dysplasia Chondroma Lipoma | |
| Diagnosis: | |
 Infarcted Intra-osseous Lipoma. Biopsy evaluated at AFIP. | |
| Intraosseous lipomas are seen most commonly in long tubular bones. The fibula, femur, tibia and calcaneous are the most common sites, in descending order of frequency. A metaphyseal location is characteristic in tubular bones. The lesion has been reported in the ribs, skull, sacrum, spine, mandible, bones of hands, feet and shoulder.
The lesion is typically lytic with a sclerotic border, usually thin. Osseous ridges are frequently seen. Bone expansion is common. Cortical destruction and periosteal reaction are absent. | |
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