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Fig. 4 —45-year-old man with lipoma of left forearm that was resected and proven histologically. A, Axial fat-suppressed spin-echo T1-weighted (TR/TE, 650/15) image obtained after contrast administration shows internal enhancement of septations in mass, a nonspecific finding that can occasionally be seen with well-differentiated liposarcoma. Voxel was placed over area of abnormal signal. Note that this image was obtained on different day from day on which MR spectroscopy was performed because all MR spectroscopy imaging was obtained before contrast administration in this series. B, Single-voxel MR spectroscopy image obtained in area of abnormal signal shows large lipid peak, confirming lipomatous nature of mass, with no detectable choline to suggest malignancy.