extent of resection
The degree of tumor removal achieved during surgery, categorized as gross total, subtotal, or biopsy, with prognostic implications.
Full Definition
Extent of resection (EOR) refers to the degree of tumor removal achieved during neurosurgical procedures, typically categorized as gross total resection (GTR, >95% removal), subtotal resection (STR, 90-95%), partial resection (<90%), or biopsy only. EOR is determined through comparison of preoperative and postoperative MRI imaging, measuring residual enhancing tumor volume. Maximizing EOR while preserving neurological function is a primary goal in brain tumor surgery, as greater extent of resection correlates with improved progression-free and overall survival in most primary brain tumors. The assessment requires standardized imaging protocols and volumetric analysis techniques.
Usage
Usage note: Abbreviate as EOR after first mention; specify percentage when available; requires volumetric analysis for accuracy.
In Context
- "Postoperative imaging confirmed gross total resection with no residual enhancing tumor." — operative summary
- "EOR analysis showed 87% tumor removal, classified as subtotal resection." — volumetric assessment report