右乳内侧肿物 ，发现3年，质中等，活动，触之疼。大体：肿物3.5×3×1.5cm，有包膜，切面有一小硬结直径0.5cm。

梭形细胞脂肪瘤。

I didn't finish the above comment, the system already kicked me out. :-) I would like to say that the tumor appears well demarcated (maybe encapsulated), with mature adipose tissue (the fat vacuoles are the same size and shape, didn't see lipoblasts), mixed with capillary vessels containing RBC and micro-thrombi. These are the features of a angiolipoma. It is not uncommon for this location either. It can be multiple too. Don't be panic if you see another one nearby. :-)

Angiolipoma.

1.

Agree above.

But louzhu needs carefully to review slides to exclude malignancy

“整个肿瘤大多为脂肪成分，上面图片显示的只是一小部分”，实性部分血管丰富，可能诊断血管脂肪瘤更好些，也可以解释“触疼”现象。

梭形细胞脂肪瘤，脂肪母细胞似乎有异型，排除高分化脂肪肉瘤

梭型细胞 脂肪瘤

肿物包膜完整，切面灰黄色；镜下脂肪组织占绝大部分，这些图片只是其中很少的区域。

支持，除外脂膜炎

梭形细胞脂肪瘤

脂膜炎

怎么感觉有点像血管肉瘤啊？

纤维组织中有些细胞核稍大，深染，有问题吗？