Medscape highlighted research presented by Ahmad Raza, MBBS, a Pulmonary and Critical Care Fellow at the Temple Lung Center, at the European Respiratory Society (ERS) Congress in Amsterdam, which showed that bilateral heterogenous emphysema was the most common presentation in patients referred for bronchoscopic lung volume reduction (BLVR). Heterogeneity is defined as the difference in the percentage of emphysematous destruction between the target lobe and the nontargeted ipsilateral lobe by 10% or 15%.