A 65-Year-Old Woman Comes to the Office Complaining of Left

A 65-year-old woman comes to the office complaining of left limb weakness and fatigue. The pain is exacerbated by raising her hand over her head. The patient's symptoms started after the last hospitalization. Physical examination shows no sensory loss, but the patient lost the ability to abduct the arm above the horizontal line. When the patient is instructed to press against the wall, the left scapula lifts off the thoracic wall. Which of the following conditions is the cause of the patient's presentation?

A) Anterior dislocation of the shoulder joint
B) Fracture of the middle third of the clavicle
C) Mastectomy with axillary lymph node removal
D) Total thyroidectomy
E) Violent stretch between the head and the shoulder