Minor Pain, Major Injury: Recognizing a Full Pec Tear

Presentation

A patient came to Thompson Chiropractic Clinic with acute left shoulder pain and weakness following a fall onto an outstretched arm. Interestingly, the pain itself was relatively minor and had improved quickly within a few days, but notable bruising had developed under the left pec and across the left shoulder.

Examination

Several findings pointed strongly toward a serious injury. A palpable mass was present in the upper left quadrant of the chest, consistent with a retracted, ruptured muscle belly. The left nipple showed a classic "dropped nipple sign," and the bruising pattern was one commonly associated with a full pectoralis major tear. Perhaps most telling: the weakness was present without significant pain, when a tendon fully ruptures, the pain fibers rupture with it, so a full tear often hurts less than a lesser strain would.

Diagnostic Workup

Given this combination of findings, Dr. Osborne suspected a full pectoralis major tear and referred the patient out immediately, with an urgent MRI scheduled.

Diagnosis & Outcome

The MRI confirmed the suspected full pectoralis major tear. The patient underwent successful surgery within three weeks of that first appointment.

A Second Look Changes the Picture

The patient had already seen a physician prior to this visit and had been diagnosed with a muscle strain, a reasonable read given how mild the pain actually was, which is part of what makes this injury so easy to underestimate. Getting that second look mattered a great deal here, not because anything had been done wrong, but because catching this specific injury early is what makes the difference between a good outcome and a missed window.

Key Takeaway

Timing was everything here. Surgical success rates for this type of injury drop significantly just a few months after the initial injury, which is why recognizing the pattern early, and referring urgently rather than waiting to see if things improved, made all the difference in this outcome.