Extent of perilesional edema differentiates radionecrosis from tumor recurrence following stereotactic radiosurgery for brain metastases.
Summary of "Extent of perilesional edema differentiates radionecrosis from tumor recurrence following stereotactic radiosurgery for brain metastases."
Background Differentiation of tumor recurrence from radionecrosis is a critical step in the follow-up management of patients treated with stereotactic radiosurgery (SRS) for brain metastases. A method that can reliably differentiate tumor recurrence from radiation necrosis using standard MR sequences would be of significant value. Methods We analyzed the records of 49 patients with 52 brain metastases treated with SRS who subsequently underwent surgical resection of the same lesion. Forty-seven of the lesions had preoperative MRI available for review (90%), including T1 postcontrast, T2, and fluid attenuated inversion recovery sequences. Pre-SRS and preoperative lesion and edema volumes were manually contoured and measured in a blinded fashion using radiation treatment planning software. A neuropathologist analyzed samples for the presence of tumor and/or radiation necrosis. Results Longer time between SRS and resection (P < .001) and a larger edema/lesion volume ratio (high T2/T1c, P = .002) were found to be predictive of radionecrosis as opposed to tumor recurrence. Using a cutoff value of 10 for the edema/lesion volume ratio, we were able to predict the presence of tumor with a positive predictive value of 92%, which increased to 100% when looking only at patients who underwent resection <18 months following SRS. Conclusions On follow-up imaging, lesions with a high edema/lesion volume ratio and lesions that progress later after SRS are more likely to contain radionecrosis. These indices may help guide clinical decision making in the context of evolving lesions after SRS for brain metastases and thereby avoid unnecessary interventions.
Corresponding Author: Dwight E. Heron, MD, FACRO, FACR, UPMC Cancer Pavilion, Department of Radiation Oncology, 5150 Centre Avenue, #545, Pittsburgh, PA 15232. email@example.com.
This article was published in the following journal.
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/24243914
- DOI: http://dx.doi.org/10.1093/neuonc/not130
There is debate regarding the appropriate treatment for craniopharyngiomas, which often present symptomatically given their proximity to critical brain structures, and pose significant surgical challe...
Robust brain magnetic resonance (MR) segmentation algorithms are critical to analyze tissues and diagnose tumor and edema in a quantitative way. In this study, we present a new tissue segmentation alg...
A 26-year-old patient with recurrent choriocarcinoma of the testis presented with headache and progressive left homonymous hemianopsia. On initial MRI a grade 4 arteriovenous malformation (AVM) was id...
Tumor dormancy is one of the stages in tumor development without clinical symptoms. Tumor dormant cells may appear in early stages of tumor development, as well as in micrometastasis and minimal resid...
Object Endothelial tight junction (TJ) expression is mostly absent in cerebral cavernous malformations (CMs), which causes increased perilesional erythrocyte and fluid oozing. However, in a subset of ...
The development or worsening of macular edema following full scatter photocoagulation is a well recognized occurrence. However, there is limited literature in this regard. The purpose of...
The treatment of a specific subtype of highly malignant brain tumor (called "glioblastoma" or "glioblastoma multiforme") consists of neurosurgical resection, followed by radiotherapy and m...
Diabetic macular edema is a common cause of visual loss among diabetic patients. Studies have demonstrated the role of vascular endothelial growth factor (VEGF) in the pathogenesis of edem...
In this mono-center prospective study, the impact of changes in the sphingolipid metabolism in patients with pulmonary edema will be investigated.
Brain tumors represent the most common solid tumor of childhood. Treatment generally entails surgery and radiation, but local recurrence is frequent. Chemotherapy is often used in an adj...
Medical and Biotech [MESH] Definitions
Molecular products metabolized and secreted by neoplastic tissue and characterized biochemically in cells or body fluids. They are indicators of tumor stage and grade as well as useful for monitoring responses to treatment and predicting recurrence. Many chemical groups are represented including hormones, antigens, amino and nucleic acids, enzymes, polyamines, and specific cell membrane proteins and lipids.
The local recurrence of a neoplasm following treatment. It arises from microscopic cells of the original neoplasm that have escaped therapeutic intervention and later become clinically visible at the original site.
A symptom complex associated with CARCINOID TUMOR and characterized by attacks of severe flushing of the skin, diarrheal watery stools, bronchoconstriction, sudden drops in blood pressure, edema, and ascites. The carcinoid tumors are usually located in the gastrointestinal tract and metastasize to the liver. Symptoms are caused by tumor secretion of serotonin, prostaglandins, and other biologically active substances. Cardiac manifestations constitute CARCINOID HEART DISEASE. (Dorland, 27th ed; Stedman, 25th ed)
Abnormal fluid accumulation in TISSUES or body cavities. Most cases of edema are present under the SKIN in SUBCUTANEOUS TISSUE.
An acute disease of young pigs that is usually associated with weaning. It is characterized clinically by paresis and subcutaneous edema.