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Table 2 Summarised ceCT results in discordant cases with incremental PET/CT abnormalities that were likely false positive

From: Does addition of a diagnostic contrast-enhanced CT to a contemporaneous PET/CT provide incremental value in patients for restaging of colorectal carcinoma?

Case

PET/CT finding

ceCT finding

Followup

Anticipated impact of ceCT on management

2.1

N2 locoregional nodal minimal FDG uptake and M1 distant nodal FDG uptake

Locoregional and distant nodes up to max 10 mm.

Locoregional nodes excised, negative for metastases but performed 2 months after PET and in context of marked pathological response in previously bulky primary

No change

2.2

Minimal residual uptake in one lesion with resolution of other liver lesions

No liver lesions

In context of marked regression of prior multifocal disease likely reflected minimal residual disease. Repeat PET/CT 5 months later: no FDG avid liver lesions

No change

2.3

FDG avid lung lesion thought malignant and axillary nodal lesion thought equivocal for metastasis or inflammation

Lung lesion, no axillary nodal lesion seen

Following excision: Lung lesion positive for metastasis, axillary lesion was reactive

No change