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Pseudo-progression after stereotactic radiotherapy of brain metastases: lesion analysis using MRI cine-loops

Abstract

Stereotactic radiotherapy (SRT) of brain metastasis can lead to lesion growth caused by radiation toxicity. The pathophysiology of this so-called pseudo-progression is poorly understood. The purpose of this study was to evaluate the use of MRI cine-loops for describing the consecutive events in this radiation induced lesion growth. Ten patients were selected from our department’s database that had received SRT of brain metastases and had lesion growth caused by pseudo-progression as well as at least five follow-up MRI scans. Pre- and post SRT MRI scans were co-registered and cine-loops were made using post-gadolinium 3D T1 axial slices. The ten cine loops were discussed in a joint meeting of the authors. The use of cine-loops was superior to evaluation of separate MRI scans for interpretation of events after SRT. There was a typical lesion evolution pattern in all patients with varying time course. Initially regression of the metastases was observed, followed by an enlarging area of new contrast enhancement in the surrounding brain tissue. Analysis of consecutive MRI’s using cine-loops may improve understanding of pseudo-progression. It probably represents a radiation effect in brain tissue surrounding the irradiated metastasis and not enlargement of the metastasis itself.

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Conflict of interest

R. Wiggenraad has received speakers fee from Brainlab.

Author information

Correspondence to Ruud Wiggenraad.

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Wiggenraad, R., Bos, P., Verbeek-de Kanter, A. et al. Pseudo-progression after stereotactic radiotherapy of brain metastases: lesion analysis using MRI cine-loops. J Neurooncol 119, 437–443 (2014). https://doi.org/10.1007/s11060-014-1519-x

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Keywords

  • Brain metastasis
  • Stereotactic radiotherapy
  • Radiation necrosis
  • Cine-loop