Tab. I.

Assessing the probability of lung tumor malignancy [11]

Clinical assessment criteria	Probability of lung tumor malignancy
	Low (< 5%)	Moderate (5-65%)	High (> 65%)
Clinical examination	Young age, lower number of pack-years, smaller tumor size, smooth tumor outlines, location outside the upper lobe	A combination of high- and low-risk features	Elderly age, higher number of pack-years, history of neoplastic disease, larger tumor size, irregular, spiculated outlines, location in the upper lobe
PET/CT	Low metabolic activity in PET/CT	Slight, moderate metabolic activity in PET/CT	High metabolic activity in PET/CT
Biopsy or bronchoscopy	Benign tumor diagnosis	Non-diagnostic examinations	Suspicion of malignancy
CT follow-up	Lesion regression or disappearance, tumor size reduction. Consistent tumor image (solid: for 2 years, non-solid: for 3-5 years of follow-up)		Tumor progression

PET – positron emission tomography, CT – computed tomography