RESUMEN
PURPOSE: To perform endoscopic sinus surgery safely and effectively, surgeons need to visualize the complex anatomy of the anterior ethmoid and frontal sinus region. Because this anatomy is so variable and individualized, the foundation of understanding lies in identifying, following, and visualizing the drainage pathway patterns and anticipating possible variations. METHODS: We studied 100 sides (50 cases: 22 male, 28 female, aged 12-86, average age 46.5 years, ± 19.5) using computed tomography (CT) and multiplanar reconstruction (MPR) to identify and classify the drainage pathways leading to the frontal sinus and anterior ethmoidal cells. RESULTS: Analysis revealed five patterns of drainage pathways defined by their bony walls: between the uncinate process and the lamina papyracea [UP-LP]; between the uncinate process and the middle turbinate [UP-MT]; between the uncinate process and the accessory uncinate process [UP-UPa]; between the uncinate process and the basal lamella of the ethmoidal bulla [UP-BLEB]; and between the basal lamella of the ethmoidal bulla and the basal lamella of the middle turbinate [BLEB-BLMT]. In most cases, BLEB formed the posterior wall of the drainage pathway of the frontal sinus, indicating BLEB could be one of the most important landmarks for approaching the frontal sinus. CONCLUSIONS: As endoscopic sinus surgery depends on an understanding of this anatomy, this study may help surgeons to identify and follow the drainage pathways more accurately and safely through the anterior ethmoid to the frontal sinus.
Asunto(s)
Senos Etmoidales , Seno Frontal , Femenino , Humanos , Masculino , Persona de Mediana Edad , Drenaje , Endoscopía , Hueso Etmoides/diagnóstico por imagen , Hueso Etmoides/cirugía , Hueso Etmoides/anatomía & histología , Senos Etmoidales/diagnóstico por imagen , Senos Etmoidales/cirugía , Senos Etmoidales/anatomía & histología , Seno Frontal/diagnóstico por imagen , Seno Frontal/cirugía , Seno Frontal/anatomía & histología , Tomografía Computarizada por Rayos X/métodosRESUMEN
INTRODUCTION: Ethmoid sinus anatomy is so variable it has been referred to as a "labyrinth." Accordingly, this provides a challenge for surgeons performing ethmoidectomy. Identifying consistent anatomic features or landmarks within the ethmoid sinus can aid surgeons performing sinus surgery. The goal of this investigation was to determine if subtle anatomic features are consistently present within the retrobullar recess and could potentially serve as a reliable landmark for surgeons performing ethmoid surgery. MATERIALS AND METHODS: Ethmoid sinus anatomy was studied in 60 sinonasal complexes through several methods including gross anatomic dissection, endoscopic dissection and 3-D CT stereoscopic imaging. RESULTS: Review of gross sagittal sinonasal specimens revealed that the retrobullar recess was present in all specimens and a tissue bridge was noted emanating from the basal lamella deep within the retrobullar recess in 23/24 gross sagittal specimens; in 1/24 specimens it was quite small or difficult to appreciate. In the radiographic analysis, the tissue bridge was noted in 17/18, in 1/18 it was not appreciated. In the endoscopic dissections it was noted in 17/18, in 1/18 it was small or not appreciated. CONCLUSION: The small tissue bridge, or ponticulus within the retrobulbar recess was seen in nearly all ethmoid sinuses studied leading us to venture that could be used in surgery to orient surgical dissection through the basal lamella into the posterior ethmoid region.
Asunto(s)
Puntos Anatómicos de Referencia , Endoscopía/métodos , Senos Etmoidales/cirugía , Procedimientos Quirúrgicos Otorrinolaringológicos/métodos , Cadáver , Senos Etmoidales/diagnóstico por imagen , Humanos , Imagenología Tridimensional , Tomografía Computarizada por Rayos X/métodosRESUMEN
Human sinonasal anatomy varies widely between patients, challenging surgeons operating in the sinuses. Ethmoid sinus anatomy is so variable it has been referred to as a labyrinth. Accordingly, reliable, consistent anatomic landmarks aid surgeons operating in this region. The goal of this investigation was to explore our observations and hypothesis that the ethmoidal bulla and the uncinate process are not entirely separate structures but rather attach, and the attachment could potentially provide a landmark for surgeons performing ethmoid and frontal recess surgery. Ethmoid sinus anatomy was studied in 57 sinonasal complexes through a variety of methods including gross anatomic dissection, endoscopic dissection and 3D CT stereoscopic imaging. The uncinate process and ethmoidal bulla were noted to fuse at the superior aspect of the hiatus semilunaris in 57/57 cases, forming a genu-like feature in the anterior ethmoid. This consistent anatomic feature related closely to the frontal sinus drainage pathway, which drained medial to it in 44/57 (77%) cases. The anterior ethmoidal "genu" appears to be an excellent anatomic feature that surgeons can use during ethmoid and frontal recess surgery. High resolution 3D stereoscopic CT scan is capable of demonstrating sinonasal anatomy in a detailed fashion previously only achieved by cadaveric dissection. This technology can potentially allow for a virtual dissection of a patient's anatomy prior to surgery and could improve minimally invasive procedures and reduce complications. Clin. Anat. 32:534-540, 2019. © 2019 Wiley Periodicals, Inc.
Asunto(s)
Senos Etmoidales/anatomía & histología , Disección , Endoscopía , Senos Etmoidales/cirugía , HumanosRESUMEN
La anatomía del etmoides y del complejo osteomeatal ha sido la base fundamental de muchos avancescientíficos especialmente en el campo de la cirugía endoscópica. Por ello el objetivo del presente trabajo es describir la anatomía etmoidal, del complejo osteomeatal y sus variantes anatómicas en los cadáveres del anfiteatro de la Universidad del Rosario, un estudio observacional descriptivo tiposerie de casos donde se tomaron 20 cabezas, se hicieron disecciones y mediciones en ellas. Se evaluó la concordancia interobservador e intraobservador en las variables numéricas con el paquete SPSSversión 11.5, se halló el coeficiente de correlación intraclase (CCI), el intervalo de confianza (IC) tomando significativo CCI > 0.6; y para las variables categóricas el test de concordancia Kappa, a un nivel de significancia de cinco por ciento (0.05). De los resultados finales, se encontraron promedios para la apófisis Crista Galli de longitud ancho yprofundidad. Para la lamela lateral se encontró mayor frecuencia el Keros II en 45% seguida de Keros I (42,5%) y en menor frecuencia Keros III en 12,5%. Se halló el promedio de la longitud antero-posterior y supero-inferior de los cornetes superior, medio y supremo. Se describieron seis variantes anatómicas de la forma del cornete superior y se encontraron cinco variantes anatómicas de la forma del cornete medio. El cornete supremo se encontró en el 15% de los especímenes y se encontraron dosformas del mismo. Fueron observadas 10 variantes anatómicas de la inserción superior de la apófisis unciforme y ocho tipos de inserción inferior del mismo. Se creó una clasificación de la inserción inferior de la apófisis unciforme con respecto al ostium del seno maxilar...
Ethmoidal and osteomeatal complex anatomy had been fundamental base of several scientific advances, especially in endoscopic sinus surgery. The objective of this study is to describe ethmoidal anatomy, osteomeatal complex and its anatomical variations in corpse´s anphitheater of the Rosario University; in an observational descriptive studytype case series. Twenty heads (20) were evaluated with interobserver and intraobserver measures in numercial variables with SPSS version 11.5, it was obtained the intraclass correlation coefficient (ICC), the confidence interval (CI) with significance ICC>0,6 and categorical Kappa variable test with levelof significance of five percent (0.05).Of the final outcomes, Crista galli process wide and depth length was obtained. Lateral lamella was more frequent Keros type II (45%) than type I (42,5%) and type III (12,5%). For the superior, supreme and middle turbinates was found its length and incidence. Six anatomical variations of the superior attachment of the uncinate process and five anatomical variations of the form of middle turbinate weredescribed. The supreme turbinate was found in 15% of the specimens and there were two forms of it. Ten anatomical variations of the superior attachment of the unciform process and eight types of its inferior attachment were found. It was created a new classification of inferior attachment of uncinate process with relation to the maxillary ostia...