Table 2. Reasons of pleuromediastinal drainage via thoracostomy or cervicotomy in descending necrotizing mediastinitis.

Reasons	Frequency
Combined lung abscess and empyema	1
Right multiloculated empyema	5
Bilateral empyema	4
Left multiloculated empyema	4
Purulent mediastinitis and unruptured mediastinal pleura	4
Closed tube thoracostomy drainage	2
Cervical mediastinotomy	4
Thoracotomy with percardiostomy	2