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

EJNMMI Reports

Table 4 Summarised ceCT results in discordant cases with incremental ceCT abnormalities that were likely false positive

Case	PET/CT finding	ceCT finding	Followup	Anticipated impact of ceCT on management
4.1	No metastases	Liver metastasis	Post-chemotherapy scans. Microwave ablation to liver after scans. Followup PET 13 months later: negative for metastases. Clinical follow up 3 years later: well	Appropriate change^a
4.2 (Fig. 2)	No metastases	Necrotic right external iliac nodes: Interval decrease in size	Post-chemoradiotherapy. Following excision: nodes negative for metastasis.	Inappropriate change
4.3	No metastases	Left paraaortic node suspicious for metastasis	Repeat CT 39 months later: node stable in size, CEA undetectable	No change
4.4	No metastases	Left upper quadrant omental deposit	Clinical follow up 1.5 months later: no evidence of metastases	No change
4.5	No metastases	Equivocal change in known penile metastasis	MRI showed improvement in penile metastasis	No change