This results from paralysis of the serratus anterior muscle because of injury to the long thoracic nerve (nerve of Bell) (an injury that can occur during radical mastectomy).

The medial border of the scapula moves laterally and posteriorly away from the thoracic wall and gives the scapula the appearance of a wing, especially when a person leans on the hand or presses the upper limbs against a wall.

When the arm is raised, the medial border and inferior angle of the scapula pull markedly away from the thoracic wall.

The arm cannot be abducted above the horizontal because the serratus anterior muscle is unable to rotate the glenoid cavity superiorly to allow complete abduction of the arm.

Patient cannot push or punch if they have this condition.
- Winged scapula classified by Sir Charles Bell.
- Affects C5 to C7.
- Sir Charles Bell is the same guy who discovered Bell's Palsy.
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