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13.Benign neoplasms can be multiple, as is shown in this uterus with leiomyomas of varying size, but all benign and well-circumscribed firm white masses. Remember that the most common neoplasm is a benign nevus (pigmented mole) of the skin, and most people have several. As a general rule, benign neoplasms do not give rise to malignant neoplasms.

13.良性肿瘤可以是多样的,如图所示子宫平滑肌瘤样大小不等，但几乎所有的良性肿瘤都为边界清楚，坚实的白色肿物。最常见的是多数人都有的皮肤胎痣。一般地说，良性肿瘤不会发展成恶性肿瘤。