"A dedicated study of pectoralis muscle may be required and a typical shoulder MRI usually does not allow optimal visualisation of the pectoralis major muscle 2. In obtaining images, respiratory motion artifact may be minimised by abdominal breathing techniques."
"thickness in AP dimension"
"Pectoralis major injuries are uncommon and include strains, tears and ruptures."
"associated with weight lifting (mostly bench press), although also reported during various athletic activities e.g. martial arts, boxing, American football, rugby, wrestling, gymnastics, parachuting 1,3,4,6"
"Optimal methods for treatment of pectoralis major tears remain under investigation and depends on location and extent of tear, chronicity, and patient factors. There is increasing evidence that surgical management may improve outcome in physically active patients 5."