RESUMO
INTRODUCTION AND AIMS: The frontal sinus ostium is frequently difficult to recognize because of anatomical structures that hide it. The objective of the present study was to identify and describe the frontal recess anatomy that impairs the endoscopic recognition of the frontal sinus ostium. STUDY DESIGN AND METHODS: A prospective study was conducted by consecutive endoscopic dissections of 32 cadavers (59 sides), 10 (31.25%) females and 22 (68.75%) males. After resection of the lower portion of the uncinate process, with preservation of its upper insertion, we evaluated which anatomical structures needed to be removed for complete visualization of the frontal sinus ostium. RESULTS AND CONCLUSIONS: Visualization of the frontal sinus ostium after resection of the lower portion of the uncinate process was possible in only 11 (18.64%) nasal cavities. The uncinate process (terminal recess) was the main anatomical structure that impaired the recognition of the frontal sinus ostium, present in 45 (76.27%) nasal cavities, followed by the ethmoid bulla (16.95%) and agger nasi cells (6.78%).
Assuntos
Dissecação/métodos , Endoscopia/métodos , Seio Frontal/anatomia & histologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Cadáver , Feminino , Humanos , Masculino , Pessoa de Meia-IdadeRESUMO
INTRODUÇÃO E OBJETIVO: O óstio do seio frontal freqüentemente apresenta difícil reconhecimento devido a estruturas anatômicas que encobrem sua visibilização. O objetivo principal desse estudo foi identificar e descrever as estruturas anatômicas do recesso frontal que dificultam o reconhecimento do óstio do seio frontal. CASUíSTICA E MÉTODOS: Foi realizado um estudo prospectivo por meio de dissecção endoscópica consecutiva de 32 cadáveres (59 fossas nasais), 10 (31,25 por cento) do sexo feminino e 22 (68,75 por cento) do sexo masculino. Após exérese endoscópica da porção inferior do processo uncinado, com a preservação da sua inserção superior, avaliamos quais estruturas anatômicas necessitavam ser removidas até a completa visibilização endonasal do óstio do seio frontal. RESULTADOS E CONCLUSÃO: A visibilização do óstio do seio frontal após a exérese da porção inferior do processo uncinado foi possível em apenas 11 (18,64 por cento) fossas nasais. O processo uncinado (recesso terminal) representou a principal estrutura anatômica que dificultou o reconhecimento endonasal do óstio do seio frontal, ocorrendo em 45 (76,27 por cento) fossas nasais, seguido pela bolha etmoidal (16,95 por cento) e a célula agger nasi (6,78 por cento).
INTRODUCTION AND AIMS: The frontal sinus ostium is frequently difficult to recognize because of anatomical structures that hide it. The objective of the present study was to identify and describe the frontal recess anatomy that impairs the endoscopic recognition of the frontal sinus ostium. STUDY DESIGN AND METHODS: A prospective study was conducted by consecutive endoscopic dissections of 32 cadavers (59 sides), 10 (31.25 percent) females and 22 (68.75 percent) males. After resection of the lower portion of the uncinate process, with preservation of its upper insertion, we evaluated which anatomical structures needed to be removed for complete visualization of the frontal sinus ostium. RESULTS AND CONCLUSIONS: Visualization of the frontal sinus ostium after resection of the lower portion of the uncinate process was possible in only 11 (18.64 percent) nasal cavities. The uncinate process (terminal recess) was the main anatomical structure that impaired the recognition of the frontal sinus ostium, present in 45 (76.27 percent) nasal cavities, followed by the ethmoid bulla (16.95 percent) and agger nasi cells (6.78 percent).