Dr. Ali Raja is the co-author for American College of Emergency Physicians and the American College of Physicians guidelines committee for pulmonary embolism.  He was also voted the most outstanding speaker for our 2017 Maine Medical Center Winter Symposium.  We chose to highlight his lecture - "D-dimer, Wells, PERC rule - Pearls and Pitfalls of Pulmonary Embolism Diagnosis" as our next feature film.  In this lecture, Dr. Raja shares some pearls and pitfalls on the various tools at our fingertips for the diagnosis of pulmonary embolism.