Fig. 4From: Schwannomas of the greater superficial petrosal nerve – case series, discussion of surgical techniques, and review of literatureA Preoperative coronal and (B) axial CT scan, showing a widened facial knee and GSPN canal (arrows), the osseus tegmentum tympanii seems to be thinned out. In addition, notice the osseous discontinuity with the accompanying destruction of the canal roof of the petrous bone. Coronal comparison of the affected left (C) and the healthy right side (D) to highlight the anatomical differences (arrows)Back to article page