{"id":"bcc3cc3f-dcee-4d92-9a64-1e0477bdcfda","slug":"predicting-the-presigmoid-retrolabyrinthine-space-using-a-sigmoid-sinus-tomography-classification-a-cadaveric-study","title":"Predicting the presigmoid retrolabyrinthine space using a sigmoid sinus tomography classification: A cadaveric study","authors":["José Orlando de Melo","João Klescoski","Cristian Ferrareze Nunes","Gustavo Augusto Porto Sereno Cabral","Mário Alberto Lapenta","José Alberto Landeiro"],"abstract":"Background: The presigmoid retrolabyrinthine space is characterized by a widely variable size. The main structure involved in this large variability is the sigmoid sinus. Few studies have attempted to establish a reliable classification of sigmoid sinus to predict the presigmoid retrolabyrinthine space. We used tomographic mapping of human cadaver temporal bones to classify the position of sigmoid sinus and performed a cadaveric study to assess the validity of a novel classification in predicting the presigmoid retrolabyrinthine space. Methods: Ten human cadaver temporal bones were randomly selected and subjected to fine-cut computed tomography scanning to classify the position of sigmoid sinus using a reference line. The specimens were classified into medial and lateral groups and each specimen was then subjected to mastoidectomy. The groups were compared using quantitative and qualitative analysis. Results: The medial group showed a larger distance between the sigmoid sinus and the external auditory canal and a shallower lateral semicircular canal. In the lateral group, the mastoidectomy was more demanding, and the Trautmann's triangle was typically narrower and often “hidden” medially to the sigmoid sinus. Conclusions: The tomographic classification proposed in this study predicts, in a cadaveric model, the presigmoid retrolabyrinthine space. It may help the surgeon select the best approach to reach the petroclival region and lead to safer neurological and otological surgeries.","thumbnailUrl":"https://sni-digital-videos.s3.amazonaws.com/articles/bcc3cc3f-dcee-4d92-9a64-1e0477bdcfda/featured/hero-1782420986146.png","publishDate":"2014-08-30T00:00:00.000Z","doi":"10.4103/2152-7806.139819","categories":["Original Article"],"fullTextUrl":"https://surgicalneurologyint.com/api/articles/bcc3cc3f-dcee-4d92-9a64-1e0477bdcfda/pdf"}