Start the incision 4 fingers inferior to the nipple in the midclavicular line and continue along the submammary crease.
Note: When making the incision in women, it is important to prevent possible cosmetic problems along the breast.
Continue the incision diagonally to the posterior axillary line at a point about 2 fingers superior to the tip of the scapula.
Note: Depending on the case at hand, the incision may be extended as far as the sternum. In posterolateral thoracotomy, continue the incision around the tip of the scapula to about 4 fingers lateral to the spinous processes.
Divide the subcutaneous fatty tissue with electrocautery down to the muscles.