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科普:1098-(学习笔记)孪生姐妹:增生性肌炎和增生性筋膜炎!

  • 2026-11-08 08:01:00
科普:1098-(学习笔记)孪生姐妹:增生性肌炎和增生性筋膜炎!

日拱一卒,功不唐捐!

一花一世界,一镜一病理

今日学习笔记

增生性肌炎和增生性筋膜炎是一类发生于筋膜、皮下或肌肉内的结节状纤维母细胞和肌纤维母细胞性增生,以病变内含有体积较大、有明显核仁的节细胞样纤维母细胞为病理特征。

免疫组化(两种疾病):梭形细胞主要表达vimentin,程度不等表达α-SMA和MSA,偶可表达KP-1,一般不表desmin。节细胞样细胞主要表达vimentin,可弱阳性表达actins,但不表desmin 和myogenin。

增生性肌炎

临床特点:

①“快”:病程短,通常为数天至2周内发现迅速增大的肿块。

②“深”:好发于深部骨骼肌,最常见于胸背部、肩胛带、大腿的肌组织。

③“中老年”:多见于50岁以上成年人,但也可见于儿童。

④“自限”:本质为良性自限性病变,局部切除后极少复发,绝不转移。

肉眼观:在肌束间呈灰白色梁束状或瘢痕状,或仅表现为肌肉内的束状结构,或呈楔状,其尖端插入肌肉间,底部位于筋膜上,直径约1-6cm。

镜下特点:

①低倍镜下,病变的最大特征是保留完整的骨骼肌框架。周围可见红细胞外渗,破渔网样。

②高倍镜下,需要抓住以下两个核心:

A:“棋盘格”样结构:

• 增生的纤维母细胞和肌纤维母细胞在残留的骨骼肌纤维束之间穿插生长。

• 横切面上,被分隔的肌纤维束宛如棋盘格中的格子。这是低倍镜下的重要诊断线索。

B:“两大核心细胞群”:

• 基底样嗜碱性巨细胞:体积大,胞质丰富呈深嗜碱性(类似节细胞或横纹肌母细胞)。核大空泡状,核仁明显,但核分裂象极其罕见.此为PM最特征性的细胞。

• 梭形纤维母细胞/肌纤维母细胞:形态温和,呈梭形,胞质嗜酸性。可有一定数量的核分裂象,但无非典型核分裂。

③少数病例可见骨化生,类似骨化性肌炎。

低倍镜下显示“棋盘”样结构

周围可见红细胞外渗,破渔网样

肌纤维间增生的纤维母细胞/肌纤维母细胞、节细胞样细胞以及介于两者之间的过渡形细胞。

增生性筋膜炎

临床特点:发生于中老年人,两性均可发生,以男性略多见。好发于四肢皮下,以上臂最为多见,其次为大腿,躯干也可发生,头颈部较少见。

肉眼观:在脂肪小叶的纤维性间隔中呈扁圆形或伸展状,灰白色,质地较硬,周界不清,无包膜,直径多在5cm以下,平均为2.5cm。

镜下特点:主要累及皮下浅筋膜,由大量增生的梭形纤维母细胞/肌纤维母细胞、多边形或圆形节细胞样细胞以及形态上介于两者之间的不规则形过渡细胞组成,间质含有多少不等的黏液样物质和胶原纤维。纤维母细胞和肌纤维母细胞多呈梭形和胖梭形,也可呈星状或不规则形,核膜厚,染色质呈空泡状,可见核仁,核分裂象多少不等,但无病理性核分裂。节细胞样细胞体积较大,胞质丰富,双染性至嗜碱性,核大,圆形或卵圆形,常偏向胞质一侧,核膜厚,可见1-2个深蓝色或紫色包涵体样的大核仁,枭眼样,散在或成群分布于纤维母细胞或脂肪细胞之间。

病变位于皮下浅筋膜

病变内含有梭形、不规则形、星状和大多边形节细胞样细胞

大量的节细胞样细胞

节细胞样细胞分布于脂肪细胞之间

今天就学到这吧, 行文将至,我们明天见喽!❤❤❤

最后祝大家夜夜平安

最后的最后祝你我身体健康 

生活美满 工作顺利

所愿皆所得

接下来

做一个收集病理典型镜下图片公告:

  Hi,各位病理同仁们:由于现实生活中,遇到典型的案例或者疾病的种类不全,所以有时候很多疾病或者奇奇怪怪的病理镜下图片,是不容易遇到的。在这里我想有个小的诉求:病理可爱的同仁们,如果遇到典型的病例或者新病例,可以私信投稿给我哦,大家一起来学习、讨论。让Pathology札记变为病理启蒙者的学习大家园!

声明:本人科普文章仅代表个人观点,且我不是知识的生产者,所用的参考文献已详细标记出处,侵权请联系删除;再者科普所有内容及观点均不保证正确,仅供个人交流学习用,不能作为医疗建议或参考;最后欢迎大家留言指正,共同学习进步!

博 主 寄 语

  稻盛和夫:“人是思想之物,精神之物,人的力量在心上。心力涣散,勇者也会胆怯;心力专凝,弱者也会变强”。一生的效果都是由心发出。所有的一切可以说都是由我们的心所决定的,或者说,我们现在身处的环境,就是由我们的内心所营造的。你的心力不强,你就是弱,有能力也发挥不出来。而你心力强大,能力稍微弱一点,也是可以成长起来的。心力,是力量之源!心力决定了你的人生上限。要记住,人生就是提高心力的过程。心力如何,直接决定着一个人的意志、力量和能力,也决定着人生走向和人生状况。

自律且上进

自由且独立

清醒且透彻

参考文献:《刘彤华诊断病理学》第4版、王坚、朱雄增《软组织肿瘤病理学》第2版、陈杰《临床病理学》第2版。部分文章及图片来自网络公众号,感谢支持!文章部分案例图片来自:小红书号:801643446,感谢支持!底风景图片来自:小红书号:5394318504;底文章来源:摘自人民日报。

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  1. CONNECT:[ UseTime:0.000844s ] mysql:host=172.18.0.4;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000929s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000555s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000434s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000606s ]
  6. SELECT * FROM `set` [ RunTime:0.000355s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000684s ]
  8. SELECT * FROM `article` WHERE `id` = 577039 LIMIT 1 [ RunTime:0.000475s ]
  9. UPDATE `article` SET `lasttime` = 1794098933 WHERE `id` = 577039 [ RunTime:0.001596s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000320s ]
  11. SELECT * FROM `article` WHERE `id` < 577039 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000435s ]
  12. SELECT * FROM `article` WHERE `id` > 577039 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000356s ]
  13. SELECT * FROM `article` WHERE `id` < 577039 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000569s ]
  14. SELECT * FROM `article` WHERE `id` < 577039 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000630s ]
  15. SELECT * FROM `article` WHERE `id` < 577039 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000750s ]
0.089434s