Tumor Versus Capillary Telangiectasia in Recurring Glioblastoma.

von Polenz, Isabelle; Forbrig, Robert; Albert, Nathalie L · Clin Nucl Med · 2026

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Abstract

This image highlights a diagnostic pitfall in a 65-year-old patient with recurrent glioblastoma. 18 F-FET-PET revealed 2 hotspots with focally enhanced uptake: local tumor recurrence (TBR max 2.3) on the left and another lesion in the right anterior cingulate gyrus (TBR max 1.8), suspicious for a distant tumor manifestation. However, multimodal MRI revealed a benign capillary telangiectasia in the anterior cingulate gyrus. While 18 F-FET-PET is highly sensitive for detecting tumor activity, vascular malformations may also exhibit moderate tracer uptake. Therefore, careful interpretation and comparison with multiple MRI sequences are essential.

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