Fibroses of lung
Infections (e.g., lung abscess, bronchiectasis, infective endocarditis)
Neoplastic (e.g., lung adenocarcinoma)
Gastrointestinal (e.g., chronic liver disease, inflammatory bowel disease, celiac disease)
Endocrine (e.g., hyperthyroidism)
Renal disease (chronic)
Cardiac (i.e., cyanotic congenital cardiac disease)