6.部分病例可见原位尿路上皮癌或乳头状尿路上皮癌,部分病例的表面黏膜可完全正常;
7.常见脉管内癌栓。浆细胞样尿路上皮癌可沿着筋膜播散并浸润至腹膜,因此应对肿瘤进行广泛的取材。
浆细胞样尿路上皮癌与普通的尿路上皮癌具有相似的免疫表型特征表达GATA3(80%),P63(45%),CK7( 92%),CK20(70%)。由于CDH1基因突变,浆细胞样尿路上皮癌常出现E-cadherin表达缺失。少数可表达GCDFP15,PR,CDX2等。部分可表达CD128,需要与浆细胞瘤鉴别,但不表达CD38和MUM1等浆细胞标志物。
淋巴瘤和浆细胞肿瘤 :浆细胞样尿路上皮癌多数仔细寻找总能找到原位或普通的浸润性尿路上皮癌成分,需要注意的是浆样尿路上皮癌可表达CD138,易与浆细胞瘤混淆,免疫组织化学染色上皮标记阳性等可与淋巴瘤及浆细胞肿瘤鉴别。
转移性乳腺小叶癌:组织学相似且均表达GATA3、GCDFP15、PR等易混淆,仔细的结合病史并免疫组化染色标记P63/P40,ER以及Mammaglobin可资鉴别。
横纹肌样尿路上皮癌:瘤细胞胞浆更丰富,核仁明显,核旁可见嗜酸性中间纤维丝蛋白物球状聚集,Vimentin显示核旁球状表达,部分病例可显示INI-1表达缺失。
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