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呼吸系统小课堂呼吸系统课件之鼻腔鼻窦断层解剖及CT和MRI影像表现

  • 2026-06-24 09:48:02
呼吸系统小课堂呼吸系统课件之鼻腔鼻窦断层解剖及CT和MRI影像表现

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鼻腔由鼻前庭、鼻甲、鼻道组成。鼻腔借鼻中隔分为左右两侧,每侧又以鼻阈为界分为鼻前庭和固有鼻腔。鼻腔前下方鼻翼内面部分,前界为鼻孔,后界为鼻阈。

鼻窦是鼻腔周围颅骨内的含气空腔,腔内覆盖黏膜,并有窦口与鼻腔相通,左右成对,共4对,包含有上颌窦、筛窦、额窦和蝶窦。

鼻腔和鼻窦癌约占头颈部恶性肿瘤的3%,以男性为多见,男女之比为2:1,大部分患者发病年龄在 40岁以上,中位发病年龄为47岁。常见于吸烟者。发病与木头粉尘、制鞋业和磨面粉相关的职业有一定关系。

上颌窦癌占50%~65%,是鼻腔癌的2倍:筛窦癌少见,占10%~25%:蝶窦和额窦癌十分罕见。

鼻腔和鼻窦癌病理以鳞状细胞癌为主,还包含腺癌、肉瘤、嗅神经母细胞瘤、恶性黑色素瘤、内翻性乳头状瘤。

鼻腔癌:鳞状细胞癌好发于中、下鼻甲,易破坏鼻腔侧壁而侵入上颌窦,亦可穿破硬腭而侵入口腔。有 5%~10%的鳞状细胞癌出现颈部淋巴结转移,多数先转移到颌下淋巴结,然后至颈内静脉淋巴结链,远处转移少见。

腺癌好发于鼻腔上部,肿瘤主要向眼眶及筛窦方向扩展,易发生远处转移。

腺样囊性癌具有亲神经特性,常沿神经鞘侵犯,晚期可破坏骨壁而侵入鼻咽及颅底。

恶性黑色素瘤多见于鼻中隔或中、下鼻甲,常向上颌窦扩展或突出鼻外。约20%的恶性黑色素瘤可发生颈部淋巴结转移,远处转移较鳞状细胞癌多见。

鼻窦癌:由于鼻窦腔黏膜淋巴系统不太丰富,故鼻窦癌的淋巴转移发生较晚。

鼻腔和筛窦癌总的5年生存率42.1%,上颌窦癌总的5年生存率为32.5%~43.6%。

筛窦解剖和影像表现

筛窦位于筛骨迷路,在成人中有3-18个小房。筛窦出生即有,随后继续生长,在青春期形成不同数目的蜂窝状。筛窦分为前群和后群,两群之间被中鼻甲的基板分隔。

基板是中鼻甲附着于筛骨纸板外侧的附着部位。筛窦的前群开口于中鼻道,后群开口于上鼻道。

筛窦周围的重要结构
(1)鼻丘气房:位于中鼻甲前端鼻腔外侧壁上的一丘状隆起,称为鼻丘,因多有气腔称为鼻丘气房。鼻丘气房为筛窦的最前界,也是三叉神经、嗅神经最为丰富的神经反射区。
(2)钩突和筛泡:中鼻甲外壁上有两个隆起,其中前下方为钩突,后上方为筛泡。
(3)半月裂孔和筛漏斗:筛泡钩突之间有一半月形裂隙,称为半月裂孔,其外方有一弧形沟称筛漏斗,是额窦、前组筛窦和上颌窦引流的汇合处。
筛漏斗的前内界为钩突,后界为筛泡的前表面,外界为眶纸样板和部分上颌窦内壁。

临床上也有将筛窦分为前、中、后三组者,其分界是以与筛顶壁横行的筛前动脉为界将前组筛窦分为前组和中组筛窦。

筛窦分成6个壁:
(1)外侧壁:即眼眶内侧壁,由泪骨和纸样板组成。
(2)内侧壁:即鼻腔外侧壁上部,附有中鼻甲和上鼻甲。
(3)顶壁:即颅前窝底壁。
(4)下壁:即中鼻道外侧壁结构。
(5)前壁:额筛隐窝。
(6)后壁:蝶筛板
上颌窦解剖和影像表现

成对的上颌窦位于上颌骨体内,窦顶为眶下壁,内侧壁即鼻腔外侧壁。

上颌窦是成人鼻旁窦中最大的窦,呈不规则三角锥体形,出生时窦腔较小,在15岁左右停止生长。

牙根仅以一层薄的骨质与上颌窦相隔,故牙与上颌窦的炎症可以互相累及。

上颌窦开口于中鼻道

上颌窦底壁位置多低于硬腭水平
上颌窦分为5壁:
(1)前壁(面壁):重要结构有眶下孔,有眶下神经和血管通过。
(2)后外侧壁:与翼腭窝和颞下窝毗邻。
(3)内侧壁:即鼻腔外侧壁的大部,内有上颌窦开口。
(4)上壁(顶壁、眶壁):即眼眶的底壁,重要结构有眶下管,眶下神经和血管通过眶下管至眶下孔。
(5)底壁。也有学者将后外侧壁分为后壁和外侧壁,因此上颌窦分为6壁结构。
额筛隐窝
额筛隐窝又名额隐窝,位于眶纸样板与中鼻甲外侧壁之间。
额筛隐窝前方为鼻丘、后方为筛泡、外侧为眼眶内上壁、内侧为中鼻甲。
蝶筛隐窝

蝶窦与后组筛窦之间有一凹陷的小窝称为蝶筛隐窝,位于上鼻甲后上方、后组筛窦与蝶骨之间,后组筛窦和蝶窦开口于此。

构成眼眶内侧壁的大部分,由筛骨纸板构成,因骨壁薄如纸故名眼眶纸样板
泪囊位于眶内侧壁前部(内眦外下方)的泪囊窝内,其下半部延续为鼻泪管。鼻泪管向下、后外方走行,开口于下鼻道。
蝶窦解剖和影像表现

蝶窦出生时即已存在,窦内含有红骨髓,尚未充盈气体。蝶窦充气最早出现在2岁时,3~5岁为蝶窦的主要发育时期,10~14岁发育完全。

蝶窦成对,位于蝶骨体内,蝶鞍的下侧,向前开口于上鼻甲上方的蝶筛隐窝,通向上鼻道

蝶窦上方有蝶鞍、垂体、视交叉、视神经,下方为鼻咽顶壁,两侧为海绵窦。
额窦解剖和影像表现

额窦位于额骨的垂直部,左右各一,以额窦中隔相隔。左右额窦极少对称,窦腔大小不一,窦腔内有数个间隔。

鼻旁窦中只有额窦在出生时未发育或者未被空气充盈,大约6岁时,额窦形成或充气。

额窦开口于中鼻道

鼻旁窦的引流是通过不同的开口,主要的引流通道和结构形成窦口鼻道复合体

窦口鼻道复合体可分为前部和后部,前窦口鼻道复合体包括额窦和上颌窦开口、额隐窝、漏斗和中鼻道。前窦口鼻道复合体使额窦、前筛窦和上颌窦之间相互交通,后窦口鼻道复合体包括蝶筛隐窝和上鼻道,与后筛窦相交通。

蝶筛隐窝位于鼻中隔外侧,上鼻甲上方,开口于蝶窦。窦口鼻道复合体的重要结构包括漏斗、钩突、半月裂孔和筛泡。

漏斗是一个窄长形的管道,是上颌窦与中鼻道之间的通道。漏斗的内侧壁称之为钩突,钩突由一层薄的骨质形成,呈钩状突起,起自前筛窦底部,走向后下方,末端游离。钩突的游离缘构成半月裂孔,直接开口于中鼻道。

半月裂孔是位于筛泡和钩突之间的裂隙,漏斗开口于此。筛泡位于漏斗的上后方,与中鼻道相通,筛窦前群开口其内

THE END

申明

本公众号所有内容仅供医学专业同道学术交流,不代表任何治疗建议和治疗选择!不代表任何单位的意见和建议!本人不做任何网络问诊、付费咨询,看病咨询请至当地正规医院或附近大城市正规医院就诊。

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  1. CONNECT:[ UseTime:0.000574s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000665s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000313s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000253s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000505s ]
  6. SELECT * FROM `set` [ RunTime:0.000246s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000512s ]
  8. SELECT * FROM `article` WHERE `id` = 515323 LIMIT 1 [ RunTime:0.000412s ]
  9. UPDATE `article` SET `lasttime` = 1782283988 WHERE `id` = 515323 [ RunTime:0.001574s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000240s ]
  11. SELECT * FROM `article` WHERE `id` < 515323 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000480s ]
  12. SELECT * FROM `article` WHERE `id` > 515323 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000356s ]
  13. SELECT * FROM `article` WHERE `id` < 515323 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000704s ]
  14. SELECT * FROM `article` WHERE `id` < 515323 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000707s ]
  15. SELECT * FROM `article` WHERE `id` < 515323 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003044s ]
0.090336s