以下为句子列表：
英文: Leiomyosarcoma is the most common primary renal sarcoma. Most patients are beyond 40 years of age; M:F = 2:1. The tumor is composed of intersecting fascicles of smooth muscle cells.
中文: 平滑肌肉瘤是最常见的肾原发性肉瘤。绝大多数病人超过40岁，男：女＝2：1。肿瘤是由纵横交错的平滑肌束组成。
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英文: Three cases of leiomyosarcoma died of recurrence, only one survived 4 years after operation.
中文: 21例平滑肌瘤均行肿瘤切除术，4例平滑肌肉瘤，3例行肿瘤切除术，1例行活检术。
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英文: We believe primary cutaneous leiomyosarcoma should be considered biologically benign with regard to distant metastases, despite the malignant histologic appearance.
中文: 依据病患临床资料及肿瘤病理表徵，我们认为皮肤原发性平滑肌肉瘤虽在组织学上是恶性分化肿瘤，但病程表现近似良性。
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英文: When characteristic findings as polypoid, intraluminal, and nonobstructive masses are present on image studies, some diagnosis such as spindle cell carcinoma, leiomyosarcoma and lymphoma should be considered first.
中文: 当在图象学上有特别的发现像是类瘜肉状，腔室内的，非阻塞性的肿块时，一些诊断像是梭状上皮细胞癌，横纹肌肉瘤，淋巴瘤都需作第一考虑。
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英文: Leiomyosarcoma of the Rectum——A Clinical Analysis of 0 Cases
中文: 直肠平滑肌肉瘤(附0例临床分析)
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