Intramuscular myxoma: MR features.
Intramuscular myxoma is a benign mesenchymal lesion consisting of bland spindled cells embedded in an avascular myxoid stroma. On CT, intramuscular myxoma presents as a well-demarcated, homogeneous, low density mass situated within skeletal muscle. The attenuation of the lesion is slightly greater than water but less than that of the surrounding normal muscle, with typical values between +10 and +60 HU. There is scant magnetic resonance (MR) literature on the appearance of intramuscular myxoma; the few MR spin echo images that have been published characterize it as a homogeneous mass with signal intensity less than or equal to skeletal muscle on T1-weighted and brighter than fat on T2-weighted pulse sequences. We present two cases of intramuscular myxoma with imaging characteristics that differ from those previously reported.
Kransdorf
M J
MJ
Department of Radiology, Walter Reed Army Medical Center, Washington, DC 20307-5001.
Moser
R P
RP
Jelinek
J S
JS
Weiss
S W
SW
Buetow
P C
PC
Berrey
B H
BH
D000328:Adult; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009132:Muscles / Q000473:pathology*; D009135:Muscular Diseases / Q000175:diagnosis*; D009232:Myxoma / Q000175:diagnosis*; D013848:Thigh; D014057:Tomography, X-Ray Computed