IL1A and Buschke-Ollendorff syndrome: IL‐1α concentrations and neutrophilia in BAL presented as relative time from BOS diagnosis in culture positive and culture negative BAL samples demonstrated that there is a positive correlation between IL‐1α and time from BOS diagnosis in the BOS culture positive group (r2 = 0.38, p = 0.0016) and a non–statistically significant trend between IL‐1α and time from BOS diagnosis in the BOS culture negative group (r2 = 0.58, p = 0.10) (Figures 3C and D).