1. Pneumothorax necessitans presenting as a presternal pneumothoracocele
Sanjay P Tripathi, MD, Malek G Massad, MD, Vinod K Mehta, MD, Enrico Benedetti, MD, Alexander S Geha, MD 
The Annals of Thoracic Surgery 
Volume 69, Issue 1, Pages (January 2000)
DOI: /S (99)

2. Fig 1
A 15 × 10 cm fluctuant mass overlying the left sternoclavicular joint.
The Annals of Thoracic Surgery  , DOI: ( /S (99) )

3. Fig 2
CT scan of the chest shows a loculated left apical pneumothorax communicating with a large subcutaneous air collection anterior to the sternum. Erosions within the manubrium are suggestive of osteomyelitis.
The Annals of Thoracic Surgery  , DOI: ( /S (99) )