Fig. 2.

Example FDG PET-CT images. aLeft: maximum intensity projection (MIP) showing diffuse gastric malignancy with multiple left gastric, coeliac, portal and retroperitoneal nodes, bilobar liver metastases and a metastatic superior mediastinal node. Right: axial (PET – top, CT – middle, fused PET-CT – bottom). Arrows indicate the gastric primary (black), a regional left gastric node (blue), bilobar liver metastases (red), a portal node (green) and a small left superior mediastinal node (orange; left image). b Example FDG PET-CT images from three patients with different uptake distribution. Shown are axial images, from left to right: MIP, fused PET-CT, CT only; (i) Focal primary tumour uptake, lesser curvature of stomach, (ii) Diffuse primary tumour uptake along both greater and lesser curvatures of stomach, (iii) Lesion along lesser curvature of stomach corresponding to soft tissue on CT. Note photopaenic large simple hepatic cysts