Intraosseous Lipoma of the Femor: Image Findings

Abstract

Introduction: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.Case Report: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.Conclusion: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.

Femoral intraosseous lipoma: Case report

“…There is no age predilection and both men and women are equally affected [1]. Recently the prevalence of these tumors has been increased, because it is usually asymptomatic and has been misdiagnosed with other primary bone tumors [4]. As symptoms occur, they are manifested by pain, swelling, and tenderness.…”

Bilateral hamartomatous medullary lipoma within the nasal turbinate bones in a cynomolgus monkey (<i>Macaca fascicularis</i>)

“…Intraosseous lipomas are subdivided into three groups, depending on the degree of involution [24]. Once the tumor affects a long bone or a bone with wide marrow space, the tumor tissue extends into the marrow space [3, 12, 15, 34]. Such a lipoma is called “medullary”.…”