I notoced there are some cases of fibroepithelial lesions (biphasic tumor)in our website. I send this case to open the discussion.

Fibroepithelial tumors including fibroadenoma (FA) and phyllodes tumors (PT). The definition and classification of PT are not very agreeable among pathologists. However, they are most common classified as bengin, borderline, or malignant suggested by WHO. Some pathologists use terms of benign, low grade maligant and high grade malignant. These two systems are very similar, borderlin equal to low grade malignant.

Hope you can give your diagnosis and mention why. I assume people may have different oppinions. It is ok.  We just discuss the case.

 I mentioned above. 40 years with 1.2 cm demarcated breast mass.

Dood discusssion. Good point to ask the number of mitosis. Metotic figures are rare, 0-1/10 HPF.

 (2)Histologicalyy, the tumor has intracanalicular fibroadenoma structure  with increased stromal cellularity. Focal fronds of stroma covered by a thin layer of epithelium can be seen.

 (3)stroma cells are bland looking with rare mitosis.

 If the tumor occured in adult patient, I think it is compatible with benign phyllodes tumor.

 Thanks for sharing!

 此例考虑叶状肿瘤。

分叶状突入腔内生长，2层上皮细胞，细胞較纤维腺瘤密集，但密度较低，细胞异型性很轻，有核分裂，但不知多少？，可见脂肪浸润，未见坏死、出血。倾向良性。可否提供患者年龄？

 初步印象是叶状肿瘤，良性。

旧称“叶状囊肉瘤”已被废弃，但它概括了基本的形态特点。

叶状：管内生长的叶状突起

囊：叶状突起拥挤形成裂隙，似囊内生长。有的病变在取材时确实包裹在囊内。

肉瘤：这样概括生物学行为就不对了，哈哈。大多数叶状肿瘤是良性的。

另外还有亲上皮性生长、间质细胞丰富/异型性/核分裂数、边界不清或浸润性等特点，用于分级。

谢谢Dr.zhao！

这是一个很好的主题，乳腺纤维上皮性肿瘤包括FA(纤维腺瘤）、PT(叶状肿瘤）。

1、纤维腺瘤良性，多发生在20-30岁，极少恶变。

2、叶状肿瘤分为良性、交界性、恶性，或良性、低级别、高级别肉瘤。依靠肿瘤的大小、核丝分裂的多少、间质成份的异形性、间质成份的细胞密集程度以及手术边缘切除状况分级。

 40 y/f with breast mass, 1.2 cm.

Key:

F1-2: 20x

F3. 40x

F4-5: 100x

F6: 400x

F7: 600x

I will go to Boston for USCAP meeting tomorrow and will be back next weekend.