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Figure 3. 46-year-old male patient with lung cancer, re-staging after radiochemotherapy (RCtx) (a–c before and d–f after radiochemotherapy). (a,d) Axial PET scans show decreasing fluorodeoxyglucose uptake after RCtx in the tumour region right lower lobe indicating response to therapy (arrow). (b,e) Although in the non-contrast CT as well as in (c,f) the contrast-enhanced CT the tumour accompanying atelectasis is shown to be disappearing, a progressive mass lesion with infiltration of the left atrium is also visible caused by residual tumour and/or cardiac thrombus, only seen in the contrast-enhanced scan (f, arrow).
