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Computed tomography evaluation of the morphometry and variations of the infraorbital canal relating to endoscopic surgery / Computed tomography evaluation of the morphometry and variations of the infraorbital canal relating to endoscopic surgery
Açar, Gülay; Özen, Kemal Emre; Güler, İbrahim; Büyükmumcu, Mustafa.
  • Açar, Gülay; Necmettin Erbakan University. Meram Faculty of Medicine. Department of Anatomy. Konya. TR
  • Özen, Kemal Emre; İzmir Kâtip Çelebi University. Faculty of Medicine. Department of Anatomy. İzmir. TR
  • Güler, İbrahim; Selcuk University. Faculty of Medicine. Department of Radiology. Konya. TR
  • Büyükmumcu, Mustafa; Necmettin Erbakan University. Meram Faculty of Medicine. Department of Anatomy. Konya. TR
Braz. j. otorhinolaryngol. (Impr.) ; 84(6): 713-721, Nov.-Dec. 2018. tab, graf
Article in English | LILACS | ID: biblio-974385
ABSTRACT
Abstract

Introduction:

The course of the infraorbital canal may leave the infraorbital nerve susceptible to injury during reconstructive and endoscopic surgery, particularly when surgically manipulating the roof of the maxillary sinus.

Objective:

We investigated both the morphometry and variations of the infraorbital canal with the aim to show the relationship between them relative to endoscopic approaches.

Methods:

This retrospective study was performed on paranasal multidetector computed tomography images of 200 patients.

Results:

The infraorbital canal corpus types were categorized as Type 1 within the maxillary bony roof (55.3%), Type 2 partially protruding into maxillary sinus (26.7%), Type 3 within the maxillary sinus (9.5%), Type 4 located anatomically at the outer limit of the zygomatic recess of the maxillary bone (8.5%). The internal angulation and the length of the infraorbital canal, the infraorbital foramen entry angles and the distances related to the infraorbital foramen localization were measured and their relationships with the infraorbital canal variations were analyzed. We reported that the internal angulations in both sagittal and axial sections were mostly found in infraorbital canal Type 1 and 4 (69.2%, 64.7%) but, there were commonly no angulation in Type 3 (68.4%) (p < 0.001). The length of the infraorbital canal and the distances from the infraorbital foramen to the infraorbital rim and piriform aperture was measured as the longest in Type 3 and the smallest in Type 1 (p < 0.001). The sagittal infraorbital foramen entry angles were detected significantly smaller in Type 3 and larger in Type 1 than that in other types (p = 0.003). The maxillary sinus septa and the Haller cell were observed in 28% and 16% of the images, respectively.

Conclusion:

Precise knowledge of the infraorbital canal corpus types and relationship with the morphometry allow surgeons to choose an appropriate surgical approach to avoid iatrogenic infraorbital nerve injury.
RESUMO
Resumo

Introdução:

O trajeto do canal infraorbitário pode predispor o nervo infraorbitário a lesões durante cirurgias reconstrutoras e endoscópicas com manipulação do teto do seio maxilar.

Objetivo:

Investigamos a morfometria e as variações do canal infraorbitário e objetivamos demonstrar a relação entre elas, visando as abordagens endoscópicas.

Método:

Este estudo retrospectivo foi realizado em imagens de tomografia computadorizada multidetectora de seios paranasais de 200 pacientes.

Resultados:

Os tipos de corpos do canal infraorbitário foram categorizados como Tipo 1; inseridos no teto ósseo maxilar (55,3%), Tipo 2; projetando-se parcialmente dentro do seio maxilar (26,7%), Tipo 3; dentro do seio maxilar (9,5%), Tipo 4; localizado anatomicamente no limite externo do recesso zigomático do osso maxilar (8,5%). A angulação interna e o comprimento do canal infraorbitário, os ângulos de entrada do forame infraorbitário e as distâncias relacionadas à localização do forame foram medidos e suas relações com as variações do canal infraorbitário foram analisadas. Observamos que as angulações internas em ambos os cortes sagital e axial foram encontradas em sua maioria em canais infraorbitários Tipo 1 e 4 (69,2%, 64,7%) e, no geral, não houve angulação no canal Tipo 3 (68,4%) (p < 0,001). O comprimento do canal infraorbitário e as distâncias desde o forame infraorbitário até o rebordo infraorbitário e a abertura piriforme foram medidos e os mais longos foram identificadas no Tipo 3 e os mais curtos no Tipo 1 (p < 0,001). Os ângulos de entrada do forame infraorbitário em projeção sagital foram significativamente menores no Tipo 3 e maiores no Tipo 1, em relação aos outros tipos (p = 0,003). Septos nos seios maxilares e as células de Haller foram observados em 28% e 16% das imagens, respectivamente.

Conclusão:

O conhecimento preciso dos tipos de corpo do canal infraorbitário e a relação com a morfometria permitem que o cirurgião escolha uma abordagem cirúrgica apropriada para evitar lesões iatrogênicas do nervo infraorbitário.
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Full text: Available Index: LILACS (Americas) Main subject: Paranasal Sinuses / Anatomic Variation Type of study: Observational study Limits: Adult / Female / Humans / Male Language: English Journal: Braz. j. otorhinolaryngol. (Impr.) Journal subject: Otolaryngology Year: 2018 Type: Article Affiliation country: Turkey Institution/Affiliation country: &#304;zmir Kâtip Çelebi University/TR / Necmettin Erbakan University/TR / Selcuk University/TR

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Full text: Available Index: LILACS (Americas) Main subject: Paranasal Sinuses / Anatomic Variation Type of study: Observational study Limits: Adult / Female / Humans / Male Language: English Journal: Braz. j. otorhinolaryngol. (Impr.) Journal subject: Otolaryngology Year: 2018 Type: Article Affiliation country: Turkey Institution/Affiliation country: &#304;zmir Kâtip Çelebi University/TR / Necmettin Erbakan University/TR / Selcuk University/TR