Fig. 1
From: Pediatric hypersensitivity pneumonitis: literature update and proposal of a diagnostic algorithm
Diagnostic algorithm of childhood HP. Comments:*Respiratory symptoms: the clinical course can be chronic with dry cough and exertion dyspnoea in children. Usually, before diagnosis, children are treated as asthmatic without significant clinical improvement [7]. §Environmental history: bird breeding in almost all pediatric cases [41]. **in the presence of known exposure history to trigger typical HRCT and response to treatment, BAL is not necessary [29]