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.

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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.

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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.

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