Labuda Craig S,Luu Sylvester, Thompson Kaylyn and Berry-Cabn Cristbal.
Pectoralis major muscle injuries occur most commonly among men between the ages of 20 and 39 and often take place during weightlifting activities while the arm is contracted during external rotation and/or extension [1,2]. Pectoralis major injuries may present as an audible pop, tearing sensation, instantaneous pain and weakness with swelling and ecchymosis in the anterior axillary fold and lateral chest, and upper arm weakness with adduction [1,3-9]. This type of injury is relatively uncommon and accurate diagnosis may be overlooked if not correctly assessed. Diagnostic imaging confirmation is often obtained with magnetic resonance imaging (MRI). Most pectoralis major injuries in the active-duty military population occur during bench-press exercises, though a subset of injuries occur during airborne operations.