Published online before print May 30, 2002, 10.1148/radiol.2241011113
Imaging of Fatty Tumors: Distinction of Lipoma and Well-differentiated Liposarcoma1
Mark J. Kransdorf, MD,
Laura W. Bancroft, MD,
Jeffrey J. Peterson, MD,
Mark D. Murphey, MD,
William C. Foster, MD and
H. Thomas Temple, MD
1 From the Department of Radiology, Mayo Clinic, 4500 San Pablo Rd, Jacksonville, FL 32224-3899 (M.J.K., L.W.B., J.J.P.); Department of Radiologic Pathology, Armed Forces Institute of Pathology, Walter Reed Army Medical Center, Washington, DC (M.J.K., M.D.M.); Department of Radiology and Nuclear Medicine, Uniformed Services University of the Health Sciences, Bethesda, Md (M.D.M.); Department of Radiology, University of Maryland School of Medicine, Baltimore (M.D.M.); Department of Orthopedic Surgery, Medical College of Virginia, Virginia Commonwealth University, Richmond (W.C.F.); and Department of Orthopedics and Rehabilitation, University of Miami School of Medicine, Fla (H.T.T.). Received June 26, 2001; revision requested August 16; final revision received January 4, 2002; accepted January 23. Address correspondence to M.J.K. (e-mail: kransdorf.mark@mayo .edu).
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Figure 1. Transverse T1-weighted spin-echo 500/20 (repetition time msec/echo time msec) MR image shows lipoma in the supinator muscle of a 45-year-old man. The lesion (*) has a signal intensity and character identical to that of the subcutaneous adipose tissue. T2-weighted images (not shown) showed identical findings.
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Figure 2a. Transverse MR images show liposarcoma in the posterior compartment of the thigh in a 62-year-old man. (a) T1-weighted spin-echo 533/14 and (b) fat-saturated T2-weighted turbo spin-echo 2,000/60 MR images show thin (arrowhead in a) and thick (arrows) septa, as well as a confluent globular area (*) of nonadipose tissue. The thin septa are not readily appreciated in b.
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Figure 2b. Transverse MR images show liposarcoma in the posterior compartment of the thigh in a 62-year-old man. (a) T1-weighted spin-echo 533/14 and (b) fat-saturated T2-weighted turbo spin-echo 2,000/60 MR images show thin (arrowhead in a) and thick (arrows) septa, as well as a confluent globular area (*) of nonadipose tissue. The thin septa are not readily appreciated in b.
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Figure 3a. MR images show lipoma in the posterior compartment of the thigh in a 48-year-old man. Corresponding coronal (a) T1-weighted spin-echo 633/14 and (b) conventional T2-weighted spin-echo 2,050/80 MR images show a large mass with prominent thin (arrowheads) and thick (arrows) septa. (c) Transverse short inversion time inversion-recovery 2,183/40/150 (inversion time msec) MR image shows confluent globular area (*) of increased signal intensity. The MR appearance of the lesion simulates a liposarcoma.
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Figure 3b. MR images show lipoma in the posterior compartment of the thigh in a 48-year-old man. Corresponding coronal (a) T1-weighted spin-echo 633/14 and (b) conventional T2-weighted spin-echo 2,050/80 MR images show a large mass with prominent thin (arrowheads) and thick (arrows) septa. (c) Transverse short inversion time inversion-recovery 2,183/40/150 (inversion time msec) MR image shows confluent globular area (*) of increased signal intensity. The MR appearance of the lesion simulates a liposarcoma.
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Figure 3c. MR images show lipoma in the posterior compartment of the thigh in a 48-year-old man. Corresponding coronal (a) T1-weighted spin-echo 633/14 and (b) conventional T2-weighted spin-echo 2,050/80 MR images show a large mass with prominent thin (arrowheads) and thick (arrows) septa. (c) Transverse short inversion time inversion-recovery 2,183/40/150 (inversion time msec) MR image shows confluent globular area (*) of increased signal intensity. The MR appearance of the lesion simulates a liposarcoma.
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Figure 4a. Coronal MR images show liposarcoma in the thigh of a 74-year-old man. (a) T1-weighted spin-echo 493/14 image shows irregular septa (arrows, a-c) with a large amount of altered fat that is most prominent in the proximal aspect of the mass (* in a-c). (b) Corresponding short inversion time inversion-recovery 5,542/60/150 image shows the nonadipose areas to have an increased signal intensity relative to that of fat. (c) Fat-saturated T1-weighted spin-echo 782/14 image obtained after administration of contrast material shows moderate heterogeneous enhancement of nonadipose areas.
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Figure 4b. Coronal MR images show liposarcoma in the thigh of a 74-year-old man. (a) T1-weighted spin-echo 493/14 image shows irregular septa (arrows, a-c) with a large amount of altered fat that is most prominent in the proximal aspect of the mass (* in a-c). (b) Corresponding short inversion time inversion-recovery 5,542/60/150 image shows the nonadipose areas to have an increased signal intensity relative to that of fat. (c) Fat-saturated T1-weighted spin-echo 782/14 image obtained after administration of contrast material shows moderate heterogeneous enhancement of nonadipose areas.
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Figure 4c. Coronal MR images show liposarcoma in the thigh of a 74-year-old man. (a) T1-weighted spin-echo 493/14 image shows irregular septa (arrows, a-c) with a large amount of altered fat that is most prominent in the proximal aspect of the mass (* in a-c). (b) Corresponding short inversion time inversion-recovery 5,542/60/150 image shows the nonadipose areas to have an increased signal intensity relative to that of fat. (c) Fat-saturated T1-weighted spin-echo 782/14 image obtained after administration of contrast material shows moderate heterogeneous enhancement of nonadipose areas.
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Copyright © 2002 by the Radiological Society of North America.
