Intraosseous Lipoma of the Femor: Image Findings.
BACKGROUND
Intraosseous lipoma is a rare benign bone disease. Long and cancellous bones are the most locationsthat can be affected. Almost all lesions were discovered incidentally on imaging modalities that were done during an unrelated investigation. As it is rare, it may be mistaken for nonossifying fibroma, aneurismal bone cyst, simple bone cyst, bone infarct or chondroid tumors. Recently with the high quality imaging modalities such as CT scan and/or MR imaging, the diagnosis of intramedullary lipoma and some other bone lesions can be done without the need for bone biopsy and surgery.


METHODS
We're reporting a rare case of intraosseous lipoma of the distal femur. Plain film radiography showed barely visible medullary expansion and lucency in the distal left femoral diaphysis. The patient underwent further evaluation with computed tomographic (CT) and magnetic resonance Imaging (MRI). According to the MRI and CT scan findings, intraosseous lipoma was confirmed and the need for more diagnostic tests were eliminated.


CONCLUSIONS
Although Intraosseous lipoma doesn't have any manifestations clinically but it should be considered in the differential diagnosis of bone pains. MRI has an important role in characterization of soft tissue and bone marrow lesions therefore non-surgical approach for most of the patients with intraosseous lipoma would be beneficial.
Associate professor, Radiology, Imam Khomeini Hospital, Keshavarz Boulevard, Tehran University of Medical Sciences, Tehran, Iran.
Hadi Rokni
HR
Yazdi
Associate professor, Radiology, Imam Khomeini Hospital, Keshavarz Boulevard, Tehran University of Medical Sciences, Tehran, Iran.
Bahman
B
Rasouli
Associate professor, Radiology, Imam Khomeini Hospital, Keshavarz Boulevard, Tehran University of Medical Sciences, Tehran, Iran.
Ali
A
Borhani
Radiologist, Atyeh Hospital, Farahzadi Blvd, Tehran, Iran.
Mohammad Mahdi
MM
Noorollahi
Computed Tomography; Introsseous lipoma; Magnetic resonance imaging; femur