Abstract
Objective: The authors describe magnetic resonance (MR) findings in eight patients with histologically confirmed focal myositis. Materials and methods: In each patient, axial TSE T1-weighted and fast short-tau inversion recovery (STIR) images were obtained using a 1.5-T MR scanner. Three patients also underwent dynamic contrast-enhanced MR examination using a GE T1-weighted sequence. The following features were evaluated: anatomical distribution, extent of the involvement, signal intensity characteristics, dynamic enhancement pattern and outcome at follow-up examinations. Results: Seven of eight lesions were located in the lower extremities, one of eight in the arm; four of eight involved part of a muscle, two of eight diffusely involved a muscle and two of eight showed multifocal involvement of two or more muscles. All lesions were hyperintense on fast-STIR images: the hyperintensity was homogeneous in six of eight and inhomogeneous in two of eight. On T1-weighted unenhanced images, all lesions but two appeared isointense or slightly hypointense in comparison to normal muscles; two lesions showed a slight hyperintensity. Dynamic enhancement pattern corresponded to the type usually seen in benign soft tissue lesions. All lesions disappeared. Conclusion: Focal myositis is an uncommon pseudotumour which should be considered in the differential diagnosis of muscular masses and myopathies.
Original language | English |
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Pages (from-to) | 571-578 |
Number of pages | 8 |
Journal | Skeletal Radiology |
Volume | 38 |
Issue number | 6 |
DOIs | |
Publication status | Published - Jun 2009 |
Keywords
- Magnetic resonance imaging
- Muscles
- Myositis
- Pseudotumour
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging