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MIMICS OF SOFT-TISSUE SARCOMAIN: BENIGH LESIONS

INTRODUCTION

INTRAMUSCULAR MYXOMA

  • Benign, no sex predilection
  • Generally occurs in age group > 40 years
  • Thighs, shoulder, gluteal region, arm
  • Maybe associated with fibrous dysplasia of the skeleton
  • Prognosis excellent, local recurrence rare

Click on image(s) to view JPEG image(s).
1.

Patient 8
47-year-old female with surgically proven intramuscular myxoma of right proximal thigh.


Sagittal T1W MR image reveals extremely low signal intensity mass which is well defined. This extreme low signal intensity on T1W MR images would be unusual for sarcoma and is a feature of intramuscular myxoma. Differential diagnosis would include rare intramuscular ganglion or cysts.

2.


Sagittal T2W MR image reveals high signal intensity mass. The high signal intensity is nonspecific unlike the extreme low signal intenstiy noted on T1W MR images.


1.

Patient 9
49-year-old female with surgically proven intramuscular myxoma of leftl thigh.


T1W MR image reveals extremely low signal intensity well circumscribed mass.

2.


Gross photograph of resected specimen. At surgery the intramuscular myxoma contained gelatinous material.

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Last updated; September 2003
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