title: Quantitative study on endoscopic endonasal approach to the posterior sino-orbito-cranial interface: implications and clinical considerations.
abstract: The posterior sino-orbito-cranial interface is a critical area in the skull base since it represents a gateway to deeper vital regions. Quantification of the surgical freedom for any given point/area is an objective method for comparing in a reproducible way different surgical approaches. Three freshly injected cadaver heads (six sides) were dissected under the magnetic navigation control system. The surgical freedom (SF) and the angle of attack of fixed target points were determined from the ipsilateral nasal fossa, from the contralateral nasal fossa (after posterior septectomy), and after an anteromedial maxillotomy (according to the Denker procedure). The mean pre-operative SF value resulted to be 403.07 ± 102.73 mm(2) for the ipsilateral nostril, increasing by 126.97 % for the binostril approach, by 118.45 % for the monolateral nostril approach after anteromedial maxillotomy, and by 310.48 % for the binostril approach after bilateral anteromedial maxillotomy. Laterally extended lesions require an anteromedial maxillotomy, while more medially located lesions can be managed by means of a posterior septectomy. When addressing the posterior sino-orbito-cranial interface, the transnasal binostril approach and anteromedial maxillotomy both increase the SF. The choice between them depends on exact position, relationship and clinical behaviour of the lesion to treat.
authors: Department of Otorhinolaryngology, Azienda Ospedaliero-Universitaria Pisana, Pisa, Italy.
authors: Iacopo
authors: I
authors: Dallan
authors: Riccardo
authors: R
authors: Lenzi
authors: Matteo
authors: M
authors: de Notaris
authors: Paolo
authors: P
authors: Castelnuovo
authors: Mario
authors: M
authors: Turri-Zanoni
authors: Stefano
authors: S
authors: Sellari-Franceschini
authors: Alberto
authors: A
authors: Prats-Galino
mesh_terms: D002102:Cadaver; D004210:Dissection; D004724:Endoscopy / Q000379:methods*; D006801:Humans; D008279:Magnetic Resonance Imaging; D009296:Nasal Cavity / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000601:surgery; D009915:Orbit / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000601:surgery; D019291:Skull Base / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000601:surgery*; D014057:Tomography, X-Ray Computed