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ClinicalTrials.gov NCT04505150 . Registered on 7 August 2020. Pulmonary alveolar proteinosis is a rare interstitial lung disease characterized by accumulating surfactant materials in the alveoli. The autoimmune form is by far the most common in adults, while in the pediatric age group, the vast majority of cases are congenital. We report a case of an adolescent patient diagnosed with autoimmune pulmonary alveolar proteinosis, which is unusual in this age group. A-15 year-old Saudi male presented to the emergency department with a history of shortness of bre