Prospective Analysis of ¹⁸F-FDG PET/CT Predictive Value in Patients with Low Rectal Cancer Treated with Neoadjuvant Chemoradiotherapy and Conservative Surgery

Table 1

Tumors characteristics at the initial staging.

Mean lesion length	47.2 mm (range 20–100 mm)
Mean distance between lesion lower edge and anal verge	3.70 cm (range 1–8 cm)
	n (56)	(%)
Characteristics of lesions
Vegetans	43	76.8
Infiltrans	13	23.2
Eccentric	42	75
Concentric	14	25
Ulcerated	19	33.9
Not ulcerated	37	66.1
Histotypes
Adenocarcinoma	53	94.6
Mucinous adenocarcinoma	3	5.4
Grading
G1	6	10.7
G2	26	46.4
G3	14	25
GX	10	17.9
cTNM staging
II	31	55.4
III	25	44.6
cT
T2	14	25
T3	42	75
cN
N0	36	62.3
N1	20	35.7