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A 29-year-old man presented to Emergency Department with nonspecific symptoms. Through a series of radiological and invasive diagnostic studies we finally reach an unexpected diagnosis of hypersentivity pneumonitis; this is a complex and heterogeneous disease which diagnosis can be challenging as its clinical, radiologic and histopathologic features overlap with those of other interstitial lung diseases (ILDs). Diagnosing an ILD is a dynamic process, and that is the reason why complex cases discussed in a multidisciplinary team may need to be reconsidered in light of evolution of the disease and the results of the performed exams with a flexible approach.