组织学上，可见多种成熟组织成分。
Histologically, a variety of mature tissue elements may be found.
较厚的色素痣中可有神经及结缔组织成分。
Thicker moles also contain nerve elements and connective tissue.
MR图像缺乏特异性，其表现主要依赖于组织成分的相对比例。
MR imaging findings are nonspecific and dependent on the relative proportion of tissue components.
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