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Parosteal lipoma: MR imaging characteristics
M D Murphey1, D L Johnson, P S Bhatia
1Department of Diagnostic Radiology, University of Kansas Medical Center, Kansas City 66160-7234.
AJR. American Journal of Roentgenology
|January 1, 1994
Summary
Magnetic resonance (MR) imaging is superior for evaluating parosteal lipomas, revealing osseous reactions and aiding surgical planning. It effectively identifies nerve involvement and muscle atrophy, crucial for preoperative assessment.
Area of Science:
- Radiology
- Oncology
- Orthopedics
Background:
- Parosteal lipomas are benign bone tumors characterized by a fatty component and reactive bone formation.
- Accurate preoperative assessment is crucial for surgical planning and optimal patient outcomes.
Purpose of the Study:
- To determine the characteristic features of parosteal lipomas on magnetic resonance (MR) imaging.
- To evaluate the utility of MR imaging in the preoperative assessment of parosteal lipomas.
Main Methods:
- Retrospective review of eight patients with surgically and pathologically confirmed parosteal lipomas.
- Analysis of imaging studies including conventional radiography, MR imaging, CT, conventional tomography, and scintigraphy.
Main Results:
- All cases showed osseous reactions, with varying degrees of cortical thickening or excrescences, firmly attaching the lipoma to the bone.
- MR imaging demonstrated superior multiplanar capabilities and contrast resolution compared to CT for assessing the lipomatous component, anatomical location, and relationship to surrounding structures.
- MR imaging effectively identified associated findings such as cartilage, fibrous tissue, muscle atrophy, and nerve impingement, aiding in the localization of nerve involvement.
Conclusions:
- MR imaging is the most valuable imaging modality for presurgical evaluation of parosteal lipomas, complementing conventional radiography.
- Its multiplanar capabilities and superior contrast resolution enhance the detection of muscle atrophy and nerve involvement, guiding surgical intervention.