Objective To study the MRI performance of phyllodes tumors and to improve the diagnostic level .Methods The MRI data of 13 patients with phyllodes tumors of the breast verified by histopathology were analyzed .The MRI fea‐tures analyzed included morphological features , signal intensity , appearance of dynamic contrast enhancement (DCE‐MRI) ,the type of time‐signal intensity curve(TIC) ,and the features on DWI ,and compared with the results of patholo‐gy .Results 13 cases of PTB were single .Tumor size is 6 .2 cm × 4 .2 cm~1 .2 cm × 1 .1 cm .4 tumors are lobular and seems like the fusion of multiple nodules ,9 tumors are mild lobular .Strip between leaf separated extends to the tumor in‐terna in 8 cases .Lesions showed middle signal or low signal on T1WI ,9 cases showed mixed high signal and 4 cases showed homogeneous high signal On T2WI .8 cases showed high signal and 5 cases showed slightly high signal on DWI(b=800 s/mm2 ) .6 cases were simultaneously detected ADC ,all tumors showed high signal .11 cases showed homogeneous enhancement and 2 cases showed heterogeneous with cystic unreinforced area on DCE‐MRI .Type Ⅱ of TIC were shown in 10 cases ,type in 2 cases and type Ⅲ in 1 case .Among the 13 cases of PTB ,9 lesions were benign and 4 were borderline tumors ,there is no malignant PTB .Conclusion The findings of PTB on MRI have some characteristics .MRI helps diag‐nosis of the PTB .%目的：分析乳腺叶状肿瘤（PTB）的MRI表现，提高对该病的认识和诊断水平。方法回顾性分析经手术病理证实的13例PTB的M RI表现，包括肿瘤的形态特征、平扫信号强度、动态增强表现及时间信号强度曲线，类型、DWI信号特征，并与病理结果对照。结果13例PTB均单发。病灶大小为6．2cm ×4．2cm～1．2cm ×1．1cm。4例分叶状呈多发结节融合样改变，9例边缘轻度分叶，8例在分叶间见条状分隔延伸至肿瘤内部。M RI平扫T1 WI呈等或稍低信号， T2 WI 9例呈混杂高信号，4例呈均匀高信号。DWI（b值＝800s／mm2）8例呈较高信号，5例呈稍高信号；6例同时检测了ADC图，呈高信号。动态增强扫描11例较均匀明显强化，2例不均匀明显强化，见囊变未强化区。T IC 10例呈Ⅱ型，Ⅰ型2例，Ⅲ型1例。术后病理诊断：良性9例，交界性4例，未见恶性 PTB。结论 PTB的 M RI表现具有一定特征性， M RI检查有助于该病的诊断。
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