Avaliação em peças anatômicas da área do triângulo de trautman nos diferentes passos do acesso transpetroso

Abstract

Introdution: The approaches the skull base lesions involve anatomical domain and surgical skill. The approach depends on the lesion, beyond patient preconditions. Wherever possible, hearing and facial mimic should be preserved. Literature is scarce about the real increase in surgical areas involving the Trautman´s triangle. Aims: The goal of this study was to calculate the areas of surgical approaches to the petrous region, taking as starting the Trautman´s triangle as the starting area. Material and Method: In a cross-sectional study 20 anatomic pieces were evalueted and submitted to dissections, wich corresponded to the petrous surgical steps: retrolabyrintine, partial labyrintectomy and total labyrintectomy. Areas corresponding to each dissection (A1, A2, A3 and A4) were measured by mathematical formulations using measurements of straight segments evaluated by digital caliper. The measures were treated statistically. Results: The average of dissected areas were: 373.98 mm2 (A1), 409.65 mm2 (A2), 533.23 mm2 (A3), 586.02 mm2 (A4) demonstrating progressive increase (p < 0.05). Comparing consecutive measures, the biggest difference was observed between the A2 and A3 (difference of average 123.57 mm2). Conclusion: The present study allowed to conclude that there was an increase of the studied areas as the dissection progresses, and the difference of the average between consecutive areas was greater among the superior labyrintectomy and posterior labyrintectomy.