Table 3. Comparison between Fleischner and British Thoracic Society (BTS) recommendations guidelines for management of subsolid pulmonary nodules.

Subsolid nodules	Fleischner					BTS
	<6 mm (<100 mm3)	>6 mm (<100 mm3)				<5 mm	>5 mm
Single
Ground glass	No routine follow-up	6–12 m CT to confirm persistence, then CT every 2 yrs until 5 yrs				No follow up	CT in 3 m, then:
							Resolved: discharge
Part solid	No routine follow-up	3–6 m CT to confirm persistence. If unchanged and solid component remains <6 mm: annual CT for 5 yrs					Stable: assess risk of malignancy (Brock model): low risk = follow up. high risk = follow up, biopsy or resection
Multiple	3–6 m CT. If stable consider 2–4 yrs CT	3–6 m CT, subsequent management based on the most suspicious nodules					Growth/altered morphology: resection

m, months; yrs, years; d, days.