Risk factors associated with postoperative cerebrospinal fluid leak after endoscopic endonasal skull base surgery: Two-center retrospective cohort study.

Background: Over the past two decades, endoscopic endonasal skull base surgery (EESBS) has revolutionized the treatment of skull base tumors by enabling minimal access to resect significant pathologies such as meningiomas, pituitary adenomas, and chordomas. Despite its efficacy, complications such as cerebrospinal fluid (CSF) leak pose significant challenges, with an average incidence of 8.9% following EESBS. Therefore, our study aims to investigate the risk factors associated with postoperative CSF leak after employing an endoscopic endonasal approach for skull base surgery, focusing on patients treated at King Abdul-Aziz Medical City in Jeddah and King Abdullah Medical City in Makkah, Saudi Arabia.

Methods: A retrospective review of patients who underwent an endoscopic endonasal approach for the resection of intradural skull base pathology between January 2016 and December 2022 was performed with a total of 51 patients. Basic demographic data were collected, along with patient comorbidities, presenting symptoms, tumor pathology, tumor site, the extent of resection, and outcomes.

Results: 51 participants were analyzed, with a mean age of 43.41. Male participants comprised (58.8%), while headaches were the most common symptom (74.5%), followed by visual disturbances (51.0%). Nonsecretory tumors predominated, primarily located in the sellar and suprasellar regions (58.8%). Gross total resection was performed in the majority (56.9%), with a 9.8% incidence of postoperative CSF leak. Notably, all four patients with CSF leak experienced preoperative headaches. Hypertension was prevalent in Cases 1 and 4, with Case 4 having a history of neurological disease and radiation therapy. Anterior skull base tumors were most frequent in Cases 3 and 4.

Conclusion: The incidence of CSF leakage after surgery in this study was similar to that previously reported. It is worth noting that repeated surgeries may increase the risk of postoperative CSF leakage. Therefore, it is important to carefully evaluate the surgical approach for tumor removal and skull base reconstruction, considering the tumor characteristics and the patient's overall condition.