The CT observation and clinical significance of pneumatization of the anterior maxillary sinus
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摘要: 目的:通过鼻窦CT观察上颌窦气化的特征,探讨上颌窦气化分型及其临床意义。方法:对100例患者的鼻窦CT结果进行观察分析。依据上颌窦内侧壁与鼻泪管、上颌窦外侧壁与眶外侧壁、上颌窦底与硬腭的解剖关系以此将上颌窦气化分型。结果:①上颌窦泪前隐窝气化分为3型:Ⅰ型:上颌窦额突气化未达鼻泪管前,左侧占42%,右侧占42%;Ⅱ型:上颌窦额突气化延伸到鼻泪管前方,但未超过鼻泪管周长1/2,左侧占39%,右侧占37%。Ⅲ型:鼻泪管前部气化超过鼻泪管周长的1/2,左侧占19%,右侧占21%。②上颌窦底腭突气化也分为3型:Ⅰ型:上颌窦腭突未气化,左侧占49%,右侧占53%;Ⅱ型:腭突气化进入鼻底,但未超过鼻腔底宽度的1/2,左侧占45%,右侧占43%;Ⅲ型:腭突气化进入鼻底超过了鼻腔底部的1/2,左侧占6%,右侧占4%。③上颌窦向牙槽突的气化分为3型:上颌窦底部不低于硬腭的口腔面为Ⅰ型,左侧占49%,右侧占51%;上颌窦底部低于硬腭的口腔面,颌窦底完整,牙根未突入上颌窦为Ⅱ型,左侧占44%,右侧占39%;牙根突入到上颌窦为Ⅲ型,左侧占7%,右侧占11%。④颧突气化分为3型。Ⅰ型:气化未超过眶外侧壁,左侧占80%,右侧占82%;Ⅱ型:超过了眶外侧壁,左侧占20%,右侧占18%;Ⅲ型:向颧骨气化,超过眶下壁,该文未观察到Ⅲ型气化。⑤上颌窦前壁气化分为3型。Ⅰ型:眶下神经管完全在骨壁内,左侧占51%,右侧占57%;Ⅱ型:眶下神经管半突入到上颌窦腔内,左侧占39%,右侧占31%;Ⅲ型:眶下神经管完全突入到上颌窦腔内,左侧占10%,右侧占12%。结论:鼻内镜上颌窦手术之前要确认上颌窦不同结构区域的气化程度,不同程度的上颌窦气化是上颌窦手术入路选择的基础,也决定着上颌窦内病变清除的难度。Abstract: Objective:To discuss the clinical significance of the pneumatization of the maxillary sinus by sinus CT.Method:One hundred patients encountered in our hospital during March 2012 and December 2012 were included in this study. The pneumatization of the anterior part of the maxillary sinus were observed.Result:①The pneumatization of prelacrimal recess was divided into 3 types.Type Ⅰ:The pneumatization of maxillary sinus frontal process did not reach into the front of the nasolacrimal duct(42% of the left, 42% of the right); Type Ⅱ:The pneumatization of maxillary sinus frontal process extended into the front of the nasolacrimal duct, but not exceeding 1/2 of the nasolacrimal duct circumference(39% of the left, 37% of the right); Type Ⅲ:The pneumatization of maxillary sinus frontal process extended into the front of the nasolacrimal duct more than 1/2 of the circumference(19% of the left, 21% of the right).②The pneumatization of maxillary sinus palatal process was divided into 3 types.Type Ⅰ:maxillary sinus palatal process non gasified (49% of the left, 53% of the right); Type Ⅱ:palatal process gasification into the nasal floor, but not more than 1/2 of the width of nasal floor(45% of the left and 43% of the right);Type Ⅲ:palatal process gasification into the nasal floor more than 1/2 of the width of nasal floor(6% of the left, 4% of the right).③The pneumatization of maxillary sinus extended into alveolar process was divided into 3 types.Type Ⅰ:the bottom of the maxillary sinus is higher than the oral surface of hard palate(49% of the left and 51% of the right); Type Ⅱ:the bottom of the maxillary sinus is lower than the oral surface of hard palate and non tooth root protruding into the maxillary sinus(44% of the left and 39% of the right); Type Ⅲ:the tooth root process was protruded into maxillary sinus(7% of the left and 11% of the right).④The pneumatization of maxillary sinus extended into the zygomatic process was divided into 3 types. Type Ⅰ:the gasification of the zygomatic process is not more than the orbital lateral wall(80% of the left, 82% of the right); Type Ⅱ:the gasification of the zygomatic process is more than the orbital lateral wall, (20% of the left, right 18% of the right); type Ⅲ:the gasification of the zygomatic process is also more than the inferior orbital wall, this paper is not observed Ⅲ type pneumatization.⑤The pneumatization of of the anterior wall of the maxillary sinus was divided into 3 types. Type Ⅰ:infraorbital nerve tube completely in the bone wall of the maxillary sinus(51% of the left, 57% of the right); Type Ⅱ:the half of the infraorbital neural tube was inburst into the maxillary sinus(39% of the left and 31% of the right); Type Ⅲ:infraorbital neural tube was totally protruding into to the cavity of the maxillary sinus(10% of the left and 12% of the right).Conclusion:The pneumatization of the anterior part of the maxillary sinus varies considerably and requires attention during ESS. The pneumatization degree of maxillary sinus should be confirmed accurately in preparation. It is foundamental for selecting the suitable surgical approach for Nasal endoscopic maxillary sinus surgery. It is also important for completely removed the maxillary lesions in operation.
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Key words:
- maxillary sinus /
- pneumatization /
- endoscopic sinus surgery /
- frontal process /
- alveolar process /
- zygomatic process /
- infraorbital nerve /
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