Retropectoralis minor space or subpectoralis minor space is the lateral most space traversed by brachial plexus and adjacent artery and vein as they pass from the axilla to the thorax, and is thus a location of potential compression leading to thoracic outlet syndrome.
It is best seen in the sagittal plane and is triangular in shape bounded by 1,2:
- anterior wall: deep surface of pectoralis minor muscle
- posterior wall: subscapularis muscle
- apex: clavicle
- floor: lateral chest wall (2nd rib)
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