PMC4891630_01
Posttraumatic pseudolipoma. Coronal T1 weighted images show a mass (arrow) in subcutaneous adipose tissue at the level of the left greater trochanter. [Powerpoint Slide]
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The lesion had a thin 1-2 mm soft tissue capsule and a few tubular soft tissue elements at its caudal aspect, which appeared to be blood vessels (Figure 1A, Figure 1B).
Posttraumatic pseudolipoma. Coronal T1 weighted images show a mass (arrow) in subcutaneous adipose tissue at the level of the left greater trochanter. Note the thin peripheral T1 hypointense capsule and a few tubular non-fatty elements within the lower part of the mass (arrowhead). [Powerpoint Slide]
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There was mild amount of edema surrounding the well-defined margin (Figure 2, Figure 3).
Posttraumatic pseudolipoma. Coronal STIR demonstrates the hypointense mass (arrow) matching the signal of subcutaneous fat. Hyperintense signal is present along the periphery of the mass, and within a few tubular elements at the inferior part of the mass, representing small vessels. [Powerpoint Slide]
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There was mild amount of edema surrounding the well-defined margin (Figure 2, Figure 3).
Posttraumatic pseudolipoma. Axial FSE T2 with fat suppression. Mass (arrow) is isointense to subcutaneous fat, with a thin high T2 signal capsule (arrowhead). Note poor fat suppression at the periphery due to field inhomogeneity from patient's large body habitus. [Powerpoint Slide]
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Post-intravenous gadolinium, there was enhancement of the blood vessels at the caudal aspect of the lesion but no enhancement of the remainder of the lesion (Figure 4).
Axial pre and post gadolinium subtraction image. Mass has mild peripheral enhancement (arrow) and enhancement of small vessels (arrowhead). Subtraction postprocessing was utilized due to poor fat suppression. [Powerpoint Slide]
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The biopsy revealed nonviable adipose tissue with clusters of histiocytes, foam cells, and multinucleated giant cells compatible with fat necrosis (Figure 5A, Figure 5B).