1. Thoracoscopy using a substernal handport for palpation
Frank C. Detterbeck, MD, Thomas M. Egan, MD 
The Annals of Thoracic Surgery 
Volume 78, Issue 3, Pages (September 2004)
DOI: /j.athoracsur

2. Fig 1
A hand is inserted through the linea alba and the substernal space into the pleural cavity.
The Annals of Thoracic Surgery  , DOI: ( /j.athoracsur )

3. Fig 2
The substernal handport allows palpation of the apex of the chest.
The Annals of Thoracic Surgery  , DOI: ( /j.athoracsur )