These results were then compared with those obtained using the algorithm. A large proportion (17 out of 23) of patients not considered by the panel to have drug-associated ILD had been categorised as having 'good' or 'limited' supporting evidence for drug-associated ILD. The initial algorithm based on the terminology used in radiology reports, without considering differential diagnosis criteria, was not adequate. Infection, heart failure and tumour progression can be differentially diagnosed and excluded using additional radiological clinical data.