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Surrounding muscle edema detected by MRI is valuable for diagnosis
of intramuscular myxoma.Oncol Rep.
2004 Jan;11(1):143-8.
We recently experienced 4 cases of intramuscular myxoma and analyzed
MRI findings, comparing them with histological ones. Results showed
that all tumors were depicted with a homogeneous low signal intensity
on T1-weighted images and a markedly high signal intensity on
T2-weighted images, findings which are similar to those of cystic
lesions like intramuscular ganglions. However, tumors were diffusely
and finely enhanced on T1-weighted images with intravenous gadolinium
administration. Three cases showed the characteristic fat rim and fat
cap. A diffuse edematous lesion demonstrating intermediate signal
intensity on T1-weighted images and high signal intensity on
T2-weighted images was also found in the adjacent muscle surrounding
the tumor in 3 of 4 cases. In this lesion, tumor invasion, diffuse and
severe muscle degeneration, blood and lymphatic congestion with
exudates, and reactive adipose tissue formation were observed. The
present results suggested that for the clinical diagnosis of
intramuscular myxoma with MRI examination, the combination of three
MRI signs such as homogeneous low signal intensity on T1-weighted
mages, markedly high signal intensity on T2-weighted images, and an
enhancement effect with contrast medium are important, but the fat rim
or fat cap, and the surrounding muscle edema as detected by MRI are
also characteristic and allow for a more firm diagnosis. We presume
that the diffuse and severe muscle fiber degeneration induced by
tumors may cause such specific surrounding muscle edema.
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Intramuscular Myxoma
Visit:
Soft Tissue Pathology
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| Fine needle
aspiration of intramuscular myxoma of the tongue. A case report.Acta
Cytol. 1993 Mar-Apr;37(2):226-8.
Intramuscular myxoma of
the tongue is a rare, benign, mesenchymal neoplasm that has sometimes been
found in conjunction with systemic syndromes. We report a case of
intramuscular myxoma of the tongue diagnosed by fine needle aspiration
cytology and briefly discuss the significance of this lesion. |
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February 2008
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