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Magnetic resonance
imaging of intramuscular myxoma with histological comparison and a
review of the literature.Skeletal
Radiol. 2005 Jan;34(1):19-28. Epub 2004
Oct 22.
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. |
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Intramuscular Myxoma
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Intramuscular myxoma of scalene muscle: a case report.Auris
Nasus Larynx. 2004 Sep;31(3):319-22.
Intramuscular myxoma is
a benign mesenchymal tumor that commonly occurs in the larger skeletal
muscles, and is rare in the head and neck. A case of intramuscular myxoma in
the scalene muscle is described. This is the first report of this tumor
arising in that muscle. It is difficult to diagnose pre-operatively from
clinical features, CT scan and ultrasonography of the neck because of the
lack of characteristic manifestation or radiographic features. Intramuscular
myxoma has an infiltrative tendency, so there are several reports of
recurrence because of incomplete excision or enucleation. In our case no
recurrence was observed for 4 years, since the tumor was removed with the
muscle adherent to it. |
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February 2008
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