54 y.o. male presents s/p accidental precordial stab wound with a box cutter at a construction site.  The patient's vitals are stable and he is in no acute distress.  The only wound you find on the patient is in the left precordial region over the left pectoralis muscle.  It is 1.0 cm in length and there is no active bleeding.  His cardiac and pulmonary exams are normal.  Upright chest radiograph at the bedside was unremarkable.  Due to your concern of possible cardiac injury, you perform a focused cardiac ultrasound.

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