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Intramuscular myxoma: characteristic MR imaging features
Laura W Bancroft1, Mark J Kransdorf, David M Menke
1Department of Radiology, Mayo Clinic, 4500 San Pablo Rd., Jacksonville, FL 32224-3899, USA.
AJR. American Journal of Roentgenology
|April 18, 2002
Summary
Magnetic Resonance (MR) imaging can identify intramuscular myxoma by revealing a perilesional fat rind and high signal intensity on T2-weighted sequences. These MR imaging features aid in prebiopsy diagnosis and surgical planning.
Area of Science:
- Radiology
- Oncology
- Musculoskeletal Imaging
Background:
- Intramuscular myxoma is a rare soft tissue tumor.
- Accurate diagnosis is crucial for appropriate patient management.
Purpose of the Study:
- To identify the characteristic MR imaging features of intramuscular myxoma.
Main Methods:
- Retrospective review of MR imaging in 20 patients with intramuscular myxoma.
- Evaluation of lesion characteristics including size, shape, borders, signal intensity, enhancement, fat rind, and adjacent muscle signal.
- Correlation with clinical data such as age, sex, and tumor location.
Main Results:
- Intramuscular myxomas typically present as masses with a peritumoral fat rind (65%) and increased signal in adjacent muscle on fluid-sensitive sequences (55%).
- Lesions are usually homogeneously low signal on T1-weighted and high signal on T2-weighted or fluid-sensitive MR sequences.
- Enhancement after gadolinium administration is often intense and heterogeneous (55%).
Conclusions:
- The presence of a perilesional fat rind, fluid-like signal intensity, and adjacent muscle signal changes on MR imaging are highly suggestive of intramuscular myxoma.
- While MR imaging findings aid in diagnosis and planning, biopsy remains essential.
- Recognizing these MR imaging features improves prebiopsy diagnosis and preoperative planning for intramuscular myxoma.