中胚叶节脊索类脊椎动物胚胎的中胚层的中间部分，…
The middle zone of the mesoderm of a chordate vertebrate embryo, from which excretory tissue develops.
背景和目的：骨巨细胞瘤来源于中胚叶细胞，其肿瘤组织主要由多核巨细胞和基质细胞组成。
Background and Objective:Giant cell tumor of bone(GCT) derived from mesodermic cell, consists mostly of multinucleated giant cells and ground substance cells.
包括平滑肌肉瘤48例，中胚叶混合瘤47例，癌肉瘤8例，葡萄状肉瘤4例，内膜间质肉瘤37例，纤维肉瘤1例，恶性淋巴瘤8例。
Of the 153 cases, 48 were leiomyosarcomas, 47 mixed mesodermal sarcomas, 37 endometrial stromal sarcomas, 8 carcinosarcomas, 4 sarcoma botryoides, 1 fibrosarcoma, and 8 malignant lymphomas.
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