PMID: 24353989Dec 20, 2013Paper

Treatment-induced tumor-like lesions in the course of neurooncological therapy

Magyar onkologia
György Attila BagóImre Fedorcsák

Abstract

The proper interpretation of imaging changes in the course of multimodal neurooncological therapy (neurosurgery, radiotherapy, chemotherapy, stereotactic radiosurgery) is crucial. The appearance of abnormal or new contrast-enhancing lesions does not indicate obvious tumor progression, in the contrary they are frequently induced by the oncological therapy itself. The differentiation of real tumor progression from therapy-induced lesions is essential, since the diagnosis of progressive disease results in the termination of the current regimen and initiation of second or third line therapy, if possible. The most common frequent therapy-induced tumor-like lesions include the followings: pseudoprogression seen at 1-3 months after the completion of concomittant radiochemotherapy of high-grade gliomas, real radiation necrosis which can develop even years after the completion of fractionated external beam radiotherapy of gliomas, and radiation necrosis seen after stereotactic radiosurgery delivered to metastatic brain tumors. The absorbable hemostatic materials applied to the wall of resection cavity during brain tumor surgery might cause delayed disturbancies in the blood brain barrier, inducing abnormal signal changes and contrast en...Continue Reading

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