The differential diagnosis considered for this patient includes but is not limited to: Acute MI, Aortic Dissection, Esophageal Rupture, PE, PNA, Pneumothorax, Myocarditis/Pericarditis, and MSK CP. Dissection unlikely given patient is not ill-appearing, atypical nature of pain, symmetrical pulses, no focal neuro deficit. PNA unlikely given no findings suggestive of this on physical exam, patient is afebrile with no leukocytosis, no findings on CXR. PTX unlikely given b/l breath sounds and lung marking throughout b/l lung fields on CXR. Pericarditis unlikely given that there is no prodrome of URI sx, no positional component to CP, no friction rub on exam, no suggestive EKG findings. PE was considered but unlikely given that patient has no overt risk factors such as prolonged immobilization, recent surgery, or active malignancy, and is not tachycardic, no tachypnea, and no signs/sx of DVT. ACS/MI was considered but less likely given that there are no significant EKG findings and negative troponins x2