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Fig. 1I —58-year-old man with palpable right thigh soft-tissue mass in whom imaging-guided percutaneous biopsy with needle aspiration and core biopsies revealed myofibroblastic lesion of uncertain malignant potential, possibly representing fibromatosis, schwannoma, or low-grade sarcoma (although low-grade sarcoma was favored by histology). MRI and MR spectroscopy of right thigh mass are shown, with MR spectroscopy results highly favoring malignancy. Final pathology (Figs. 1F, 1G, 1H, 1I) after resection showed low-grade sarcoma. Histology of final resection specimen shows higher power view of focal myxoid area, which is consistent with low-grade histology. (H and E, x200)