Role of ¹⁸F-Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography in the Diagnosis of Newly Found Suspected Malignant Solitary Pulmonary Lesions in Patients Who Have Received Curative Treatment for Colorectal Cancer

Table 3

Characteristics of lung lesions in patients with lung metastasis and primary lung cancer.

Variable	Primary lung cancer	Lung metastasis	value
Size of lung lesion, cm	2.8 ± 1.2	2.1 ± 1.1	0.045
Morphological score of lung lesion	3.5 ± 0.8	2.7 ± 1.0	0.010
SUVmax of lung lesion, median (range)	12.1 (1.1–23.5)	7.2 (0.6–19.4)	0.207
FDG uptake			0.675
Positive	12	25
Negative	3	4
Position			0.481
Peripheral	13	27
Central	2	2
Metastasis detected on PET/CT
Mediastinal lymph node metastasis			0.004
Yes	6	1
No	9	28
Skeletal metastasis			0.319
Yes	3	2
No	12	27
Local recurrence			1.000
Yes	1	2
No	14	27
Liver metastasis			1.000
Yes	0	1
No	15	28
CEA concentration, μg/L, median (range)	2.4 (1.0–73.3)	4.8 (1.7–69.7)	0.005

SUV: standardized uptake value; FDG: ¹⁸Fluorine-2-fluoro-2-deoxy-D-glucose; PET/CT: positron emission tomography/computed tomography; CEA: carcinoembryonic antigen.