1. 息肉状或子宫内膜肿块,浸润肌层,质软,切面鱼肉状,出血坏死常见;
2. 肿瘤广泛浸润性边缘,浸润灶融合,破坏肌层;
3. 典型的肿瘤细胞呈圆形,大小一致,核4-6淋巴细胞大,染色质细腻,核膜不规则, 核分裂像常常 > 10/10 hpfs,非典型核分裂像也可见; 可以伴有低级别梭形细胞成分常伴黏液间质
4. 细胞质相对少,嗜酸性;
5. 间质可见纤细的毛细血管网间隔,类似肾脏透明细胞肉瘤
6. 偶尔异型圆形细胞组成假乳头状/腺管状或局灶横纹肌形态,少数病例具原始神经外胚层分化,形成真或假菊型团;
8. 常伴有坏死;
10. 血管侵犯常见;
11. 偶尔只有低级别形态的间质肉瘤也可以伴有YWHAE-NUTM22融合
12. 偶尔也可以表现为多形性肉瘤形态
1. 低级别子宫内膜间质肉瘤
2. 平滑肌肉瘤
3. BCOR相关性高级别子宫内膜间质肉瘤
4. 高级别多形性未分化肉瘤
1. Lee CH et al. The clinicopathologic features of YWHAE-FAM22 endometrial stromal sarcomas: a histologically high-grade and clinically aggressive tumor. Am J Surg Pathol. 2012 May;36(5):641-53.
2. Attygale AD et al. An Unusual Case of YWHAE-NUTM2A/B Endometrial Stromal Sarcoma With Confinement to the Endometrium and Lack of High-Grade Morphology. Int J Gynecol Pathol. 2017 Mar;36(2):165-171.
3. Chiang S, Lee CH, Stewart CJR, Oliva E, Hoang LN, Ali RH, Hensley ML, Arias-Stella JA 3rd, Frosina D, Jungbluth AA, et al. BCOR is a robust diagnostic immunohistochemical marker of genetically diverse high-grade endometrial stromal sarcoma, including tumors exhibiting variant morphology. Mod Pathol. 2017 Sep; 30(9):1251-1261.