Table 3– Features of high-resolution computed tomography (CT) imaging

Patient; date	Direct signs of bronchiolitis				Indirect features of bronchiolitis		Bronchial features			Other imaging features
	Centrilobular nodules^#	Branching opacities^¶	Tree-in-bud	Bronchiolectasis	Mosaic attenuation (inspiratory CT)	Air trapping (expiratory CT)	Bronchial wall thickening	Bronchiectasis	Mucus plugging
1; Oct 2011	++	++	+			N/A	+			None
2; May 2010	+++	++	+	+		N/A	+++			Bilateral limited consolidation in upper lobes
3; May 2009	+	+	+	++		N/A			+	GGO and consolidation (left upper lobe)
3; Oct 2009	+++	+++	+++	+++		N/A		++	+++	“Finger-in-glove” bronchial tubular opacities in both upper lungs GGO and consolidation (middle lobe)
4; Jan 2006	+	+	+	+	+	+	++		+	None
5; Sep 2007	+++	++	+	++	++	+	+			None
6; Feb 2010	+	+		+	++	N/A	++			18-mm calcified hamartoma

The density of abnormal findings was rated as mild (+), moderate (++) or severe (+++). GGO; ground-glass opacity. N/A: not available. ^#: poorly defined ground-glass attenuation; ^¶: V-shaped or Y-shaped.