The goal of a new study published in the International Forum of Allergy & Rhinology was to determine the prevalence of chronic rhinosinusitis (CRS) among patients with bronchiectasis affiliated with a US tertiary medical center, and to identify which comorbid diseases are associated with the presence of CRS in patients with bronchiectasis.In this retrospective cohort study,data were obtained from a large database warehouse at a tertiary care center. Patients withbronchiectasis were identified from 2007-2017, using diagnosis codes from the ninth and tenth revisions of the International Classification of Diseases (ICD-9/10) and confirmed by radiographic evidence of bronchiectasis, on chest computed tomography (CT) scans. Patients were divided into cohorts based on presence or absence of concomitant CRS. The findings revealed CRS in 45% of patients with bronchiectasis. Females represented a majority of bronchiectasis patients, both with and without CRS. It was also found that after controlling for demographic factors, asthma, allergic rhinitis, gastroesophageal reflux disease and antibody deficiency were associated with the presence of CRS in patients with bronchiectasis.Hence, CRS had a high prevalence and was associated with numerous comorbid conditions in patients with bronchiectasis. It was stated that these findings have clinical implications in the treatment of bronchiectasis and future research.