Table 3.

Radiological findings

Visceral pleural white line	Convexity towards hilum
Absence of lung markings	Distal or peripheral to the visceral pleural white line
Displacement of mediastinum	Towards opposite side
Deep sulcus sign[19]	On frontal view, larger lateral costodiaphargmatic recess than on opposite side
	Diaphragm may be inverted on side with deep sulcus
Total/subtotal lung collapse	This is passive or compressive atelectasis
Radiographic signs in upright position	Sharp delineation of visceral pelural by dense pleural space Mediastinal shift to opposite side Air-fluid level in pleural space on erect chest radiograph White margin of visceral pleura separated from parietal pleura Usually seen in the apex of the lung Absence of vascular markings beyond visceral pleural margin May be accentuated by an expiratory film in which lung volume is reduced while amount of air in pneumothorax remains constrants so that relative size of pneumothorax appears to increase
Radiographic signs in supine position (difficult to see)	Anteromedial pneumothorax (earliest location) Outline of medial diaphragm under cardiac silhouette Deep sulcus sign