Table A3.

Reference Standard Definitions of non-expandable lung (NEL).

The diagnosis is either
	Full Expansion (A)
	Probable Expansive Lung (B)
	Definitely NEL (C)
	probable NEL (D)
Entrapped lung scoring on chest X-ray or chest CT scan
	A. Definitely free. Complete apposition of parietal and visceral pleura
	B. Probably free. Apposition of parietal and visceral pleura in most places but some residual pleural fluid
	C. Definitely entrapped. Air separating the visceral and parietal pleura around the lower lobe
	D. Probably entrapped. Some air between visceral and parietal pleura in places around the lower lobe but residual pleural fluid obscuring some areas
	E. Unable to score. Insufficient drainage of pleural fluid to allow designation in one of the prior categories.

Final NEL status: consensus diagnosis made by two interventional pulmonologists with all data—except the exploratory US-data (USE-SW, B- and M-mode)—available including follow-up four months after first visit.