Endoscopic Endonasal Surgery for Cranial Base Chondrosarcomas

BACKGROUND: Microsurgical resection via open approaches is considered the main treatment modality for cranial base chondrosarcomas (CBCs). The use of endoscopic endonasal approaches (EEAs) has been rarely reported. OBJECTIVE: To present the endoscopic endonasal experiencewith CBCs at our institution. METHODS: Retrospective review of the medical records of 35 consecutive patients who underwent EEA for CBC resection between January 2004 and April 2013. Surgical outcomes and variables that might affect extent of resection, complications, and recurrence were analyzed. RESULTS: Forty-eight operationswere performed (42 EEAs and 6 open approaches). Grosstotal resection was achieved in 22 patients (62.9%), near total (>= 90% tumor resection) in 11 (31.4%). Larger tumors were associated with incomplete resection in univariate and multivariate analysis (P =.004,.015, respectively). In univariate analysis, tumors involving the lower clivus and cerebellopontine angle were associated with increased number of complications, especially postoperative cerebrospinal fluid leak (P =.015) and new cranial neuropathy (P =.037), respectively. Other major complications included 2 cases of meningitis and deep venous thrombosis, and 1 case of hydrocephalus and carotid injury. Involvement of the lower clivus, parapharyngeal space, and cervical spine required a combination of approaches to maximize tumor resection (P=. 017,.044,.017, respectively). No predictors were significantly associated with increased risk of recurrence. The average follow-up time was 44.6 +/- 31 months. CONCLUSIONS: EEAsmay be considered a good option formanaging CBCs without significant posterolateral extension beyond the basal foramina and can be used in conjunction with open approaches for maximal resection with acceptable morbidity.