Pulmonary Agenesis and Aplasia Joshua A. Blatter Jonathan D. Finder Etiology and Pathology Pulmonary agenesis differs from hypoplasia in that agenesis entails the complete absence of a lung. Agenesis differs from aplasia by the absence of a bronchial stump or carina that…
Bronchiolitis Obliterans Steven R. Boas Keywords Bronchiolitis obliterans Bronchiolitis obliterans syndrome Bronchiolitis obliterans organizing pneumonia Cryptogenic organizing pneumonia Epidemiology Bronchiolitis obliterans (BO) is a histopathologic diagnosis characterized by chronic obstructive lung disease of the bronchioles and smaller airways, resulting from an…
Homozygous deficiency of α 1 -antitrypsin (α 1 -AT) rarely produces lung disease in children, but it is an important cause of early-onset severe panacinar pulmonary emphysema in adults in the 3rd and 4th decades of life and a significant…
Pulmonary emphysema consists of distention of air spaces with irreversible disruption of the alveolar septa. It can involve part or all of a lung. Overinflation is distention with or without alveolar rupture and is often reversible. Compensatory overinflation can be…
Plastic bronchitis is a rare condition characterized by recurrent episodes of airway obstruction secondary to the formation of large proteinaceous branching casts that take on the shape of and obstruct the tracheobronchial tree. It is not a single disease entity,…
Wheezing in Infants: Bronchiolitis Samantha A. House Shawn L. Ralston Keywords Bronchiolitis Wheezing Respiratory Syncytial Virus (RSV) General Pathophysiology of Wheezing in Infants Wheezing, the production of a musical continuous sound that originates in narrowed airways, is heard on expiration as a…
Vocal Nodules Saied Ghadersohi James W. Schroeder Keywords Vocal nodules Vocal abuse Voice therapy Vocal nodules , which are not true neoplasms, are the most common cause of chronic hoarseness in children. Chronic vocal abuse or misuse (i.e., frequent yelling and screaming)…
Tracheomalacia and bronchomalacia refer to chondromalacia of a central airway, leading to insufficient cartilage to maintain airway patency throughout the respiratory cycle. These are common causes of persistent wheezing in infancy. Tracheomalacia and bronchomalacia can be either primary or secondary…
Laryngotracheal stenosis is the second most common cause of stridor in neonates and is the most common cause of airway obstruction requiring tracheostomy in infants. The glottis (vocal cords) and the upper trachea are compromised in most laryngeal stenosis, particularly…
Epidemiology and Etiology Choking is a leading cause of morbidity and mortality among children, especially those younger than 4 yr of age. Most victims of foreign body aspiration are older infants and toddlers ( Fig. 414.1 ); males have been found…