It was with great interest we read the article by Dr. Collins and colleagues published in the August 2018 edition of Respiratory Medicine, titled “Sarcoidosis and IPF in the same patient-a coincidence, an association or a phenotype?” The authors describe the characteristics of a disease entity they coined “combined sarcoidosis and idiopathic pulmonary fibrosis (CSIPF)” [1]. We appreciate the authors’ efforts to shed light on this clinical entity, which to date has sparked debate in terms of proper classification of patients who share radiographic and histopathologic features of sarcoidosis and idiopathic pulmonary fibrosis (IPF).
