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目的：探讨四肢软组织脂肪肉瘤MRI表现与组织分化程度的关系。方法：回顾性分析6例脂肪肉瘤MRI术前图像，与术后病理组织分化程度相对照评价MRI在肿瘤的大小、形态、边界、信号特点和邻近组织结构侵犯的情况，以找出它们间的关系。结果：6例脂肪肉瘤，其中分化良好型2例，粘液型3例，多形性1例，分化良好型脂肪肉瘤因含有较大量分化成熟的脂肪细胞，在T1和T2加权均免条索状高或较高信号，肿瘤边界清楚、信号较均匀，邻近组织结构不易受累。粘液型脂肪肉瘤含大量粘液基质，仅有少量分化良好、增生的脂肪母细胞，在MRIL无或仅有少量的脂肪信号，信号轻度不均匀。多形性脂肪肉瘤属高度恶性肿瘤，瘤内有大量的出血和坏死，信号明显不均匀，通常无明显脂肪信号显示，周围组织结构受浸润和水肿。结论：根据脂肪肉瘤的MRI表现，可评估肿瘤的分化和恶性程度。
Objective: To investigate the relationship between the MRI features and the degree of histological differentiation in soft tissue liposarcoma of the extremities. Methods: The preoperative images of 6 cases of liposarcoma MRI were retrospectively analyzed. The size, shape, boundary, signal characteristics and adjacent tissue structure invasion of MRI were evaluated in comparison with the degree of pathological tissue differentiation. relationship. Results: There were 6 cases of liposarcoma, of which 2 cases were well-differentiated, 3 cases were mucinous, and 1 case was pleomorphic. The differentiated liposarcoma had a large amount of differentiated and matured adipocytes, and both T1 and T2 weighted cords were excluded. With high or high signal, the tumor has a clear boundary and a more uniform signal, and the adjacent tissue structure is not easily affected. Mucinous liposarcoma contains a large amount of mucus matrix, only a small amount of well-differentiated, hyperplastic parenchyma cells. There is no or only a small amount of fat signals on MRIL, and the signal is slightly uneven. The pleomorphic liposarcoma is a highly malignant tumor with a large number of hemorrhages and necrosis within the tumor. The signal is obviously non-uniform, usually without obvious fat signal, and the surrounding tissue structure is infiltrated and edema. Conclusion: According to the MRI appearance of liposarcoma, the differentiation and malignancy of the tumor can be evaluated.