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Figure 2. 71-year-old female patient, s/p recent gastric surgery (signet cell carcinoma), interrupted due to bleeding, referral for evaluation of residual disease. (a) Axial PET and (c) fused image demonstrate a hypermetabolic focus centrally in the middle abdomen consistent with residual tumour or a necrotic mesenteric lymph node (white arrow). (d) Contrast-enhanced CT reveals that this focus corresponds to a post-operative abscess with the typical CT pattern. (b) The non-contrast scan cannot establish the correct diagnosis. (h) Diagnostic CT could also detect the enhancing primary gastric tumour (red arrow) which (e,g) is only faintly visible on PET due to poor FDG uptake in signet cell carcinoma. (f) On the non-contrast scan, the tumour can only be suspected.
