A condition that can be (1) idiopathic; (2) congenital (dominant trait); or (3) a clue to serious underlying
pathology, including cardiovascular, hepatobiliary, mediastinal, endocrine, gastrointestinal, neoplastic,
infectious, and, especially, pulmonary
pathology, including cardiovascular, hepatobiliary, mediastinal, endocrine, gastrointestinal, neoplastic,
infectious, and, especially, pulmonary