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(A) Example of high-fat fraction tumor showing prominent lobules and sheets of adipocytes, intersected by sparsely cellular fibrous septa. Occasional atypical hyperchromatic nuclei are apparent within the fibrous stroma (400× magnification). (B) Example of low-fat fraction tumor largely composed of prominent spindle cells arising in loose fascicles within delicately collagenous stroma. Only small numbers of adipocytes are scattered within the neoplasm (100× magnification).
