Petrosal approaches for neurosurgical pathology are frequently used in clinical practice. Less often partial petrosectomies have been used to help in classical neurosurgical approaches. Our interest in the present study was initiated after 1999 by the publications of Rhoton and Samii groups on the anatomy and clinical use of the suprameatal retrosigmoid approach. Thirty-eight temporal bones were examined for microscopic morphometric analysis of the posterior surface. Computer measurements between the different structures of the posterior surface were done with designed software. Size of the posterior surface was determined by the total length of the superior border (51.69 to 69.16 mm, mean 60.98 mm) and the total area of the posterior surface 940.01 mm2 (mean). The distance between the projection of the most prominent point of the arcuate eminence on the superior border to the posterior border of the internal acoustic meatus (PBIAM) had a mean value of 12.83 mm (7.81-22.11). The wide range of these values was standardized into quartiles. The arcuate eminence was always in the third quartile (mean of 0.63, n = 37) and the projection of the PBIAM was always in the second quartile (mean of 0.42, n = 38). The distance between the PBIAM and the most lateral border of the trigeminal depression was 12.93 (mean) (range, 8.55-16.17) and between the PBIAM and the vertex was 21.27 (mean) (range, 9.82-27.92). We present a summary of these findings and its usefulness in anterior petrosectomies through the retrosigmoid and subtemporal approaches in clinical examples.
|Issue number||SUPPL. 2|
|Publication status||Published - 1 Dec 2001|