Myocardial infarction or pulmonary embolus?
D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis*; D011655:Pulmonary Embolism / Q000175:diagnosis*; D011877:Radionuclide Imaging