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Hyalinizing spindle cell tumor with giant rosettes (HSCTGR) is characterized by both giant rosette-like structures with collagen cores sparsely distributed throughout the tumor and fibromyxoid stroma. It is a rare low-grade sarcoma with indolent behavior, and wide excision with long-term follow-up is the best treatment. Although originally considered a distinct entity, it is now regarded as a variant of low-grade fibromyxoid sarcoma. We present a case of HSCTGR arising in the deep soft tissue of the left knee in a 50-year-old woman and provide a brief review of the literature for comparison.