PMC3764689_01
MIP image showing intense mediastinal tracer concentration in primary lung cancer (arrow) and diffuse mid abdominal uptake (arrow head); (b) MIP image after steroid therapy shows reduction in mediastinal tracer uptake (arrows) with complete absence of mid abdominal uptake (seen in a)
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F1
Maximum intensity projection (MIP) image showed intense mediastinal tracer concentration at the site of primary [Figure 1a-arrow]; however also seen was moderately increased tracer uptake in the mid-abdomen [Figure 1a-arrow head]. MIP image showed a significant reduction in mediastinal tracer uptake [Figure 1b-arrow] suggestive of response to chemotherapy, with no tracer uptake in the mid-abdomen.
(a) Axial CT image shows large central mediastinal mass encasing the vasculature; (b) showing FDG uptake on axial PET/CT images
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F2
On axial CT [Figure 2a-arrow] and PET/CT [Figure 2b-arrow] image, a large enhancing FDG avid mediastinal mass was seen, predominantly to the right, encasing the right main bronchus and causing vascular compression.
(a) Axial PET/CT image shows diffuse pancreatic tracer uptake; (b) Axial contrast enhanced CT image shows diffuse, homogenous, and featureless enlargement, with minimal post-contrast enhancement; (c) Axial PET/CT image after steroid therapy shows absence of tracer uptake in pancreas; (d) Axial contrast enhanced CT image (post-steroid therapy) shows restoration of normal pancreatic architecture
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F3
Also, PET/CT image showed diffusely increased tracer uptake in the pancreas [Figure 3a-arrow]. Axial contrast enhanced CT image revealed featureless pancreas with diffuse, homogenous, sausage-shaped enlargement, with minimal post-contrast enhancement, associated with diffuse narrowing of main pancreatic duct [Figure 3b-arrow]. Axial PET/CT [Figure 3c-arrow] and CT image [Figure 3d-arrow] showed no pancreatic tracer uptake, with restoration of normal size and architecture of pancreas.