extent of resection
Measure of how much tumor tissue was surgically removed, typically categorized as gross total, subtotal, or biopsy only.
Full Definition
Extent of resection (EOR) is a critical prognostic factor in neurosurgical oncology that quantifies the percentage of tumor removed during surgery. Classifications typically include gross total resection (>99% removal), subtotal resection (90-99%), partial resection (<90%), and biopsy only. EOR is determined through comparison of pre- and post-operative imaging, most commonly MRI with gadolinium enhancement. Maximum safe resection while preserving neurological function is the surgical goal, as greater EOR generally correlates with improved survival outcomes. Editorial staff should understand this term appears frequently in operative reports and outcome studies.
Usage
Usage note: Can be abbreviated as EOR after first use. Percentages should include the % symbol.
In Context
- "Post-operative imaging confirmed an extent of resection greater than 95% with minimal residual enhancement." — Radiology report
- "The extent of resection was limited by tumor proximity to motor cortex areas." — Operative summary