PMC5962786_01
Exam 1:maximum intensity projection image, fused axial images, and time-activity curves of baseline PET/CT scan. MIP image (above left image), taken 61 min post-injection, reveals lung mass, and abnormal uptake at right antecubital fossa (radiotracer injection site) and right axilla uptake thought to be the result of the infiltration. Black time-activity curve (lower right image) from injection arm sensor reveals severe infiltration during the first 40 min of the uptake period. Red time-activity curve (also lower right image) from contralateral arm sensor reveals minimal uptake. Fused PET/CT images (upper right images) reveal left upper lobe mass (SUVmax 24) and infiltration artifacts at adrenal level. No evidence of metastatic disease.
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F1
A staging 18F-FDG PET/CT scan confirmed the presence of a single, large, lung mass; however, the quality and quantification of the image was potentially impacted by a relatively severe infiltration in the right antecubital fossa (Figure 1).
Exam 2:maximum intensity projection image, fused axial images, and time-activity curves of repeat PET/CT Scan. Repeat PET/CT MIP image (above left image), taken 3 days after first PET/CT and 65 min post-injection, reveals lung mass, right adrenal lesion, prostate lesion, and some minimal abnormal uptake in left forearm (radiotracer injection site was left hand). Black time-activity curve (lower right image) from injection arm sensor reveals a nearly ideal injection. Red time-activity curve (also lower right image) from contralateral arm sensor reveals expected uptake. Fused PET/CT images (upper right images) reveal left lobe mass (SUVmax 43) and adrenal lesion.
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F2
T3N0M0. The repeat scan (Figure 2) revealed more information about the single lung lesion and also showed new disease: a right adrenal lesion and also a potential prostate lesion, not seen in Exam 1.