Controversies and challenges in outcome measurement for skull base surgery: A cross-pathology analysis

Background: Outcome measurement in skull base surgery lacks standardization, with substantial variability in definitions and reporting across pathologies. This heterogeneity prevents meaningful comparison of treatments, hinders quality improvement, and may compromise patient-centered care. While previous studies addressed pathology-specific challenges, it remains unclear whether these represent isolated issues or systemic problems requiring comprehensive solutions. Methods: This narrative review synthesized 38 studies across diverse skull base pathologies (pituitary adenomas, meningiomas, chordomas, craniopharyngiomas, and sinonasal malignancies), employing thematic analysis to identify universal outcome measurement challenges transcending specific diagnoses. Results: Five universal themes emerged, transcending specific diagnoses: (1) substantial heterogeneity in outcome definitions; (2) disconnect between clinician-centered and patient-centered priorities; (3) inadequate quality-of-life assessment integration; (4) methodological limitations in surgical approach comparisons; and (5) absence of standardized cross-pathology frameworks. These challenges persist despite pathology-specific guidelines, confirming systemic infrastructure deficits. Conclusion: Outcome measurement controversies represent systemic infrastructure challenges requiring field-wide solutions. Essential interventions include: standardized consensus-based metrics applicable across pathologies, mandatory patient-reported outcome integration, improved comparative methodology, and establishment of international registries with unified protocols. Without addressing these fundamental issues, outcome assessment will remain fragmented regardless of pathology-specific advances.