Surgical view through an endoscopic endonasal approach for resection of a petroclival chondrosarcoma. The left panel shows the tumor in the petrous apex behind the paraclival carotid artery, which has been exposed. The right panel shows the view through an angled endoscope after the tumor was removed through a contralateral transmaxillary surgical corridor, allowing for removal of the tumor behind the carotid artery. The abducens nerve (CNVI) forms the posterior boundary of the exposure within the petrous apex.
