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学习笔记:血管平滑肌瘤病理诊断

  • 2026-03-31 13:04:58
学习笔记:血管平滑肌瘤病理诊断

      遇到一例发生在下肢的结节,体积不大,直径0.5cm,有二十年的病史了,特点是疼痛。显微镜下是这样的:

低倍镜:可见一边界清楚的结节,如下图:

转高倍:肿瘤由增生的平滑肌细胞及裂隙样血管组成。

在周边发现一个很典型的厚壁血管,血管周围有增生的平滑肌细胞,增生的平滑肌围绕血管呈漩涡状排列,如下图:
再回头看一下前三张图片,肿瘤中嗜酸性胞质的梭形细胞,他们的分布、排列与上图是同一类细胞,均为平滑肌细胞,而中间的裂隙则是血管,管腔内有红细胞。而且这个肿瘤发生在下肢皮下,疼痛明显,病史很长,生长缓慢,免疫组化梭形细胞SMA阳、Desmin阳,更加认定这例就是血管平滑肌瘤。

      现在复习一下关于“血管平滑肌瘤”的知识。

      定义:血管平滑肌瘤是一种起源于血管平滑肌细胞的良性间叶源性肿瘤,属于血管周细胞肿瘤,属于软组织肿瘤,形态学上瘤细胞有向血管周肌样细胞和肌周细胞的分化趋势。其病理特征主要包括以下方面:

一、临床表现:

好发于中年女性,四肢远端真皮深部或皮下;单发,生长缓慢,常伴有疼痛★。

二、大体:

肿瘤通常呈类圆形或椭圆形,界清,直径<2cm,切面灰白、实性。

三、组织学特点:典型结构为厚壁血管+束状平滑肌+裂隙样血管腔。 

(一)实体型:由增生的平滑肌细胞及裂隙样血管组成。

(二)静脉型:由厚壁肌层血管及血管间平滑肌束组成。肿瘤内血管为厚壁静脉型,增生的平滑肌围绕血管呈漩涡状排列,瘤细胞与血管壁平滑肌细胞之间可见移行。

(三)海绵型:由海绵状扩张的血管组成,血管壁平滑肌细胞层变薄。

四、免疫组化:

平滑肌细胞表达SMA、Desmin,h-caldesmon阳,不表达HMB45。

五、鉴别诊断:

 (一)平滑肌瘤(普通型,非血管性):两者均为成熟平滑肌,梭形细胞束状排列,Desmin/SMA阳性,但血管平滑肌瘤:大量厚壁血管、血管裂隙明显、血管与平滑肌紧密交织。而普通平滑肌瘤:血管少、散在,无特征性血管结构。

(二)平滑肌肉瘤:虽然为梭形细胞、平滑肌分化,但明显细胞异型、核分裂易见(≥1–2/10HPF)、坏死、浸润性生长。

(三)血管球瘤:

1.与血管平滑肌瘤同属于血管周细胞肿瘤,两者均与血管相关、好发肢端皮下。

2.而血管球瘤★:最多见于甲床下,可见蓝色结节,疼痛,直径<1cm,界清,无包膜。

3.典型组织学表现为圆形、类上皮样球细胞,围绕血管呈同心圆排列。

4.免疫组化:瘤细胞SMA阳、h-caldesmon阳,Desmin阴(血管平滑肌瘤Desmin强阳)。

(四)肌周皮细胞瘤:

1.好发于肢体远端,无痛。

2.形态学:卵圆形或胖梭形肌样细胞呈同心圆状围绕血管生长,裂隙状、分支小血管为主,管壁伴有玻璃样变性,细胞呈血管周同心圆轮状分布。

3.免疫组化:SMA阳、Desmin阴或局灶弱阳。h-caldesmon阴或弱阳。

(五)神经鞘瘤

 1.典型组织学特点:Antoni A/B区、Verocay小体。

2.免疫组化:S-100阳、SOX10阳;平滑肌标记阴性。

(六)纤维组织细胞瘤

 1.多见于成人四肢,孤立性、缓慢生长的无痛性肿块,少数为多发结节。

2.组织学特点★:梭形/卵圆形(肌)成纤维细胞+圆形/卵圆形组织细胞养细胞+泡沫细胞+多核杜顿巨细胞+含铁血黄色沉着+少量炎细胞。

3.排列:短束状、席纹状结构,夹有胶原纤维。

4.富于细胞者核分裂较多,1~10个/HPF。

5.免疫组化:瘤细胞表达FVIIIa、vimentin,SMA/Desmin阴性或局灶阳性,部分表达CD68。

声明:以上知识点来源于病理相关书籍及网络,仅用于个人学习记录,侵权删。有部分学习体会,如有错漏,望指出,谢谢。★为副高考试常考知识点。

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  1. CONNECT:[ UseTime:0.000391s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000792s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000306s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000264s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000467s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000575s ]
  8. SELECT * FROM `article` WHERE `id` = 479040 LIMIT 1 [ RunTime:0.000567s ]
  9. UPDATE `article` SET `lasttime` = 1774998423 WHERE `id` = 479040 [ RunTime:0.019977s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000283s ]
  11. SELECT * FROM `article` WHERE `id` < 479040 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000467s ]
  12. SELECT * FROM `article` WHERE `id` > 479040 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000518s ]
  13. SELECT * FROM `article` WHERE `id` < 479040 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000679s ]
  14. SELECT * FROM `article` WHERE `id` < 479040 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000785s ]
  15. SELECT * FROM `article` WHERE `id` < 479040 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001109s ]
0.094876s