Incidental focal colorectal 18F-fluorodeoxyglucose uptake on positron emission tomography/computed tomography

Table 1 Baseline characteristics and pathologic diagnoses of the 241 elegible colorectal lesions n (%)

Variables	Total (n = 241)	Focal FDG uptake (+) (n = 95)	Focal FDG uptake (-) (n = 146)	P value
Baseline characteristics
Age, yr1 (range)	62 (29-86)	64 (31-86)	59.5 (29-84)	0.068
Males	153 (64)	57 (60)	96 (65)	0.366
Overweight or obesity (BMI > 25 kg/m2)	22 (9.1)	9 (9.5)	13 (8.9)	0.367
F/U after complete CRC resection	67 (28.2)	16 (17.9)	51 (34.9)	0.006
Pathologic diagnoses
Non specific	140 (58.1)	26 (27.5)	114 (78.1)	< 0.001
Inflammation	24 (9.9)	18 (18.9)	6 (4.1)	< 0.001
Adenoma (any size)	40 (16.6)	18 (18.9)	22 (15.1)	0.430
Advanced adenoma	18 (7.5)	16 (16.8)	2 (1.4)	< 0.001
Cancer	37 (15.4)	33 (34.7)	4 (2.7)	< 0.001
Advanced colorectal neoplasms	55 (22.9)	49/95 (51.5)	6/146 (4.1)	< 0.001

¹Median (range). FDG: ¹⁸F-Fluorodeoxyglucose; BMI: Body mass index; F/U: Follow up; CRC: Colorectal cancer.

Table 2 Positron emission tomography/computed tomograph indications of the eligible colorectal lesions

Initial cancer staging (n = 99)	After complete cancer resection (n = 87)	After cancer chemotherapy (n = 12)	Health screening (n = 31)	Others (n = 12)
Stomach: 33	Colorectum: 67	Stomach: 2
MUO: 19	Stomach: 8	OBGY: 2
OBGY: 12	Others: 12	Others: 8
Lung: 10
Hepatobiliary: 9
Others: 16

MUO: Metastasis of unknown origin; OBGY: Obstetrics and gynecology.