Colorectal cancer and 18FDG-PET/CT: What about adding the T to the N parameter in loco-regional staging?

Table 1 T stage: positron emission tomography/computed tomography vs histology

	Histology
	T ≤ 2	T3	T4	Total
PET/CT
T ≤ 2	6	0	0	6
T3	2	21	0	23
T4	0	0	6	6
Total	8	21	6	35

PET/CT: Positron emission tomography/computed tomography. χ²: 58.9, (P < 0.0001). Accuracy: 94.3% (95% CI: 87%-100%).

Table 2 N stage: positron emission tomography/computed tomography vs histology

Istologia	Histology
	N+	N-	Total
PET/CT
N+	12	3	15
N-	4	15	19
Total	16	18	34

PET/CT: Positron emission tomography/computed tomography. χ²: 9.5, (P < 0.005). Accuracy: 79.4% (95% CI: 66%-93%).

Table 3 N stage: positron emission tomography/computed tomography vs histology with N1 and N2 stratification

	Histology
	N0	N1	N2	Total
PET/CT
N0	15	4	0	19
N1	3	9	0	12
N2	0	0	3	3
Total	18	13	3	34

PET/CT: Positron emission tomography/computed tomography. χ²: 43.6, (P < 0.001). Accuracy: 79.4% (95% CI: 66%-93%).