Abstract: Objective: The objective of this study was to describe the outcomes of outpatient oncological neurosurgery (OON) in a European clinical setting and to compare them with the conventional inpatient protocol. Methods: Patients who had undergone OON (either tumor removal or biopsy) at the authors' center since 2019 were analyzed. A matched cohort of patients was selected from patients undergoing tumor surgery in the same period. Collected data included patient demographics, postoperative progress, specific location of the target lesion, and the procedure performed. Results: There were 18 patients in the case group and 59 patients in the control group. The outpatient surgeries had a same-day discharge rate of 89%, and all ambulatory patients successfully completed the Enhanced Recovery After Surgery program within 6.24 hours of the procedure. All ambulatory patients underwent Hospital-at-Home postoperative follow-up for an average of 4.12 days. Radiological complications were present in 11% of the case group and 8% of the control group. Postoperative neurological deficit occurred in 6% of the same-day discharge group and 3% of the control group. Among the patients in the control group, 3% suffered from postoperative seizures, whereas no seizures were observed in the case group. These differences were not statistically significant. General anesthesia-related complications were not observed in any of the patients. Conclusions: The authors' findings demonstrate that Enhanced Recovery After Surgery protocols and same-day discharge craniotomy for tumor resection and image-guided biopsy under general anesthesia, when patients are carefully selected, can be safely performed with excellent outcomes in a European clinical setting. The OON program proved to be a viable alternative to conventional hospitalization, showing comparable safety records and offering advantages in terms of patient recovery.

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