良性间叶瘤少见，至少由两种间叶组织混合构成，分良性和恶性。

Mesenchymomas are very rare tumors and contain at least two mesenchymal cellular elements not commonly associated Mesenechymomas may be either benign or malignant.

youdao

恶性间叶瘤并不少见，但由于病例取材局限，每把此肿瘤诊断成一种组织的肉瘤。

The malignant mesenchymoma is not rare actully, but owing to the one sidedness of sampling, it is always diagnosed pathomorphogically as one single tissue sarcoma.

youdao

镜下观，这个神经鞘瘤由梭形细胞组成(象多数间叶细胞起源的瘤)，细胞大小一致，胞浆丰富、呈粉红色。

The schwannoma is seen microscopically to be composed of spindle cells (like most neoplasms of mesenchymal origin), but the cells are fairly uniform and there is plenty of pink cytoplasm.

youdao