Magnetic resonance imaging of intramuscular myxoma with histological comparison and a review of the literature.

Published

Journal Article (Review)

OBJECTIVE: To evaluate the magnetic resonance (MR) features of intramuscular myxoma (IM) compared with its pathological findings. DESIGN: Two radiologists retrospectively reviewed records and imaging studies of patients with histologically proven IM. Two radiologists also analyzed by consensus all the MR studies (pre- and post-contrast T1-weighted and T2-weighted sequences) and a pathologist reviewed the available histological material. PATIENTS: Seventeen patients with 18 histologically proven IM were reviewed. Histological samples of 11 of these 18 tumors were available for pathological analysis. RESULTS: There were 14 women and three men, with a mean age of 58.9 years. IM involved predominantly the thigh (n=10). MR imaging showed well-circumscribed intramuscular masses, hypointense on T1-weighted and hyperintense on T2-weighted images. Eleven masses were homogeneous and seven slightly heterogeneous due to fibrous septa. Enhanced MR imaging demonstrated three different patterns: peripheral enhancement (n=1), peripheral and patchy internal enhancement (n=7) or peripheral and linear internal enhancement (n=4). Intratumoral cysts were detected in four masses. MR imaging showed the presence of a pseudocapsule (n=12), fat around the lesion (n=16) and peritumoral edema (n=16). Histologically, all the tumors were hypocellular, hypovascular and myxoid. Peripheral areas of collagenous fibers formed a partial capsule and IM often merged into surrounding muscular fibers. More cellular tumors and those with scanty myxoid stroma tended to show a more prominent internal enhancement. CONCLUSION: IM shows several recognizable MR features which suggest its diagnosis.

Full Text

Duke Authors

Cited Authors

  • Luna, A; Martinez, S; Bossen, E

Published Date

  • January 2005

Published In

Volume / Issue

  • 34 / 1

Start / End Page

  • 19 - 28

PubMed ID

  • 15538560

Pubmed Central ID

  • 15538560

International Standard Serial Number (ISSN)

  • 0364-2348

Digital Object Identifier (DOI)

  • 10.1007/s00256-004-0848-9

Language

  • eng

Conference Location

  • Germany