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Encapsulated Versus Nonencapsulated Superficial Fatty Masses: A Proposed MR Imaging Classification

Catherine C. Roberts1, Patrick T. Liu1 and Thomas V. Colby2

1 Department of Radiology, Mayo Clinic Scottsdale, 13400 E. Shea Blvd., Scottsdale, AZ 85259.
2 Department of Pathology, Mayo Clinic Scottsdale, Scottsdale, AZ 85259.



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  		Fig. 1A. —74-year-old woman with typical encapsulated, superficial lipoma (arrows) at posterior shoulder. Coronal oblique T1-weighted MR image shows fatty mass with surrounding low-signal border.

 


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  		Fig. 1B. —74-year-old woman with typical encapsulated, superficial lipoma (arrows) at posterior shoulder. T2-weighted fat-suppressed MR image confirms that mass signal intensity follows that of fat.

 


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  		Fig. 2. —74-year-old woman with firm mass (arrow) at lateral aspect of left hip corresponding to nonencapsulated fat on T1-weighted coronal MR image. Enchondroma in proximal left femoral diaphysis is partially imaged.

 


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  		Fig. 3. —68-year-old woman with nonencapsulated lipoma (arrow) at medial aspect of left thigh on coronal T1-weighted MR image.

 


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  		Fig. 4. —47-year-old woman with resected lipoma. Photomicrograph of histologic specimen shows fibrous connective tissue septa (arrowheads), which are indistinguishable from capsule microscopically, and mature lipocytes (arrow). (H and E, intermediate power)

 

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