Residual tumor

• Early adjuvant radiation reduces the rate of recurrence following surgery for silent corticotroph pituitary neuroendocrine tumors
• Surgical tumor volume reduction in patients with brain metastases: A systematic review and meta-analysis
• Impact of Extent of Resection on Survival in Brain Metastasis: An Analysis of 867 Patients
• Comparison of sodium fluorescein and sodium fluorescein with intraoperative ultrasonography Efficacy in glioblastoma resection
• Fluorescence-Guided Surgery for Gliomas: Past, Present, and Future
• Hydrocephalus after Gamma Knife Surgery for Vestibular Schwannoma Resolved by Tumor Removal without Cerebrospinal Fluid Diversion: Report of Two Cases
• Nonfunctioning Ectopic Pituitary Adenoma: A Rare Case Report from Southern Asia
• Primary intracranial cholesteatoma in the thalamus

The only study that compared this estimation with the presence of residual tumor mass on an MR image, dates back to 1994 ¹⁾.

It may be difficult to differentiate between surgically induced enhancement and residual tumor.

Intraoperative dynamic contrast enhanced MRI provides quick, reproducible, high-quality, and simply interpreted dynamic MR images in the intraoperative setting and can aid in differentiating surgically induced enhancement from residual tumor ²⁾.

The tumor status following treatment is described by the residual tumor (R) classification: R0, no residual tumor; R1, microscopic residual tumor; R2, macroscopic residual tumor. A residual tumor may be found in the area of the primary tumor and its regional lymph nodes and/or at distant sites. The R classification reflects the effects of treatment and influences further treatment planning. Furthermore, the R classification is a strong predictor of prognosis. An acceptable long-term prognosis can be expected only in R0 patients. Although there exist clear correlations between stage and R classification the differences in prognosis of R0 versus R1,2 cannot be explained by differences in stage alone.

Residual vestibular schwannoma