Flashcards in Four Deck (21):
List 7 examples of congenital defects involving the larynx.
• Laryngeal Web
What kind of diagnostic tests are useful for laryngeal congenital defects and what kinds of things can be seen?
Physical Exam –
stridor, ?absence of larynx in neck
may see lesion at intubation
Contrast Rad –
may see aspiration
abnormality seen well
– rigid endoscope preferred in LTE cleft
not generally helpful unless paralaryngeal mass
What is laryngeal atresia? What are the symptoms? Diagnostics? Treatment?
Laryngeal atresia-larynx doesn't form
symp: At birth, extreme respiratory distress with sternal and costal retractions w/o detectable airflow
Diag: usually post-mortem but possible during laryngeal intubation
What is laryngeal webs? What are the symptoms? Diagnostics? Treatment?
Laryngeal webs-partial failure of recanalization of the larynx. Thin incomplete membrane with posterior glottis open.
symp: Depends on severity: neonates-stridor, weak cry, resp. distress
Less severity (larger opening): Resp. distress w/ exercise or hoarseness.
Treatment-Depends on severity
What is laryngomalacia? What are the symptoms? Diagnostics? Treatment?
Laryngomalacia-Supraglottic structures prolapse into the airway during inspiration (they're floppy, less elastic-omega shaped epiglottis or large arytenoids
symp: Most common: Healthy child with a harsh inspiratory noise that differs with activity. High pitched fluttering.
More severe: Failure to thrive due to cyanosis and feeding difficulties.
Diag: Physical and exam
Treatment-Grow out of it in second year of life
If severe, surgery.
List 5 tracheal abnormalities.
• Tracheal Stenosis
• Tracheoesophageal Fistula
• Tracheal Bronchus
What diagnostic tests can be used for tracheal abnormalities? What can they find?
Physical Exam –
no cervical trachea, absent breath sounds, wheezing
Radiology – airway films
Contrast Radiograms –
work well but not usually necessary
lesion seen well + larynx evaluated at same time +
fixed lesions and distal extent of severe stenosis well
What is tracheal atresia?
Trachea doesn't form. Always leads to death.
What is tracheal stenosis? What are the symptoms? Diagnostics? Treatment?
Tracheal Stenosis: The C rings of the trachea wrap all the way around it so there is no posterior membrane. Can involve a short part or can involve a much longer section.
symp: First years of life-recurrent wheezing w/o responding to bronchodilators. Narrower stenosis=younger age. Nonspecific symptoms
Diag: Plain chest radiograph-->bronchoscopy and CT scan
Longer segment=Slide tracheoplasty
What is tracheal bronchus? What are the symptoms? Treatment?
Tracheal Bronchus:Abnormal bronchus arising directly from the trachea usually in right upper lobe. May supply all or part of lobe or be an extra pathway to lobe.
symp: Usually an incidental finding. Generally asymptomatic but might have recurrent infection or atelectasis
Treatment-Lobectomy but only in the case of severe recurrent infections.
What is tracheomalacia? What are the symptoms? Diagnostics? Treatment? What causes it/what are its associations?
Tracheomalacia: The C rings of the trachea are misshapen or don't wrap all around trachea leading to increased flexibility of the posterior membrane. This leads to the trachea collapsing during respiration.
symp: During quiet breathing: Harsh central expiratory wheeze.
During forced expiration or cough: ant. and post. walls may touch leading to a characteristic harsh, barking sound
In cervical trachea: may lead to dynamic inspiratory collapse with stridor.
Associations/causes: Secondary: tracheoesophogeal fistulae, esophogeal atresia, CV anomalies, or external compression from other sources.
Primary: Premature infants, mechanical ventilation leads to stretching of the C rings.
Diag: Endoscopy as patient breathes spontaneously. Not with PA x-ray.
Treatment-Mild forms-Slow improvement with growth
Severe forms Tracheostomy with positive pressure support.
What is tracheoesophageal fistula? What are the symptoms? Diagnostics? Treatment?
Tracheoesophogeal fistula: Abnormal anatomical connections b/w esophagus and trachea, usually w/ esophogeal atresia.
symp: Early in life: Feeding difficulties, drooling, and resp. distress. Possible abdominal distention. Proximal atresia--->aspirations. Should be suspected w/ recurrent aspirations when all other causes have been eliminated.
Diag: Proximal atresia: radiopaque feeding tube w/ chest x-ray. Contrast radiographic studies w/ care not to induce aspiration.
List 3 congenital defects that can occur in the bronchi?
• Bronchogenic Cyst
How are bronchial congenital defects diagnosed? What exams are used and what findings are there?
Physical Exam –
focal abnormality in chest sounds
visible but often non specific
Contrast Radiology –
best definition of airways
proximal abnormalities are seen, aid with bronchogram,
helps to delineate extent of parenchymal involvement, cysts
What are bronchogenic cysts? What are the symptoms? Diagnostics? Treatment?
Bronchogenic cysts: thin-walled structures caused by
abnormal budding of respiratory tissue from the developing respiratory tract (Fig. 37.7). They can occur anywhere along the embryonic airways, including in paratracheal, subcarinal, and intrapulmonary locations. Cysts are often lined with respiratory mucosa (Chap. 2), including functional mucus-secreting cells.
Symptoms: Most bronchogenic cysts present in the second decade of life as an incidental finding on a chest x-ray done for other reasons. However, symptoms of cough, dyspnea, persistent wheeze, or recurrent infection can lead to their detection.
Diagnostics: On a chest radiograph, cysts appear as rounded masses that may cause airway compression observable by bronchoscopy. CT imaging demonstrates
most cysts as having well-demarcated borders with variable internal densities.
Treatment: Surgical therapy is curative, particularly
when well-circumscribed cystic lesions are involved that can be easily dissected from surrounding tissues.
List 6 lung parenchyma congenital defects.
Congenital Lobar Emphysema
• Congenital Pulmonary Airway Malformation
What diagnostic exams are useful for lung congenital defects? What is found in them?
focal change in breath sounds
Radiology –often visualized but non-specific
Contrast Radiography –not useful
Endoscopy - show absence of airway, culture
CT/MRI – defines the character (cystic,solid,etc) and the extent of the lesion well
What are pulmonary agenesis/aplasia? What are the symptoms? Diagnostics? Prognosis?
Pulmonary agenesis or pulmonary aplasia: the absence
of functional lung parenchyma (Fig. 37.8). Agenesis denotes absent airways, vasculature, and lung tissue on the affected side, while aplasia refers to the presence of a rudimentary mainstem bronchus lacking vasculature and lung tissue on the affected side.
Symptoms: Most cases present in neonates with respiratory distress, cyanosis, stridor, diffi culty feeding, and an abnormal chest exam. However, some affected infants may be asymptomatic.
Diagnostics: Typically the AP chest x-ray reveals a dense homogeneous infiltrate on the affected side, a marked mediastinal shift toward it, and blurring or loss of the heart border. Pulmonary aplasia may be diffi cult to differentiate from massive atelectasis on such fi lms alone, while CT imaging can more accurately confi rm the presence or absence of pulmonary tissue on that side. Bronchoscopy permits evaluations for endobronchial lesions, compression of airways, and the presence of a bronchial stump, but may not be necessary if the results of the CT scan are conclusive. A barium swallow may be important to evaluate for the presence of a foregut communication that would require early surgical intervention.
Prognosis: The prognosis for unilateral pulmonary agenesis varies, having a reported mortality of 30%-50%, with most deaths occurring within the fi rst year of life. Survival longer than 5 years is generally consistent with a normal life span. There may be a worse prognosis with right-sided agenesis, likely due to the increased incidence of cardiovascular lesions seen with
anomalies on this side. Longitudinal pulmonary function testing reveals that with age, the patient’s FVC will mature to 50%-70% of predicted values. Coincident development of pulmonary hypertension is limited to those patients whose associated cardiovascular anomalies increase pulmonary blood fl ow as by left-to-right shunts. Most patients are asymptomatic at rest, but not surprisingly they demonstrate obvious pulmonary impairment during exercise testing (Chap. 12).
What is CCAM or CPAM? How is it classified? What are the symptoms? Diagnostics? Treatment? Prognosis?
Congenital cystic adenomatoid malformation (CCAM) or Congenital Pulmonary Airway Malformation (CPAM):
a mass of abnormally developed respiratory tissue composed mainly of terminal bronchial elements that lack distal alveolar structures. Such CCAMs are classifi ed by one of two systems: (1) as macrocystic versus microcystic; and (2) as type 1 (several large cysts), type 2 (multiple small cysts), and type 3 (a largely homogeneous, nearly solid mass). Histologically, these CCAM types correlate with the stage of development when the abnormality arose: larger cysts begin later in gestation.
Symptoms/Diagnostics: Because CCAM is often associated with polyhydramnios, it may be noted by fetal ultrasound, allowing subsequent prenatal planning to optimize lung growth. Type 1 and macrocystic CCAMs present most commonly within the fi rst several months in term infants exhibiting respiratory distress, cyanosis, and feeding diffi culties. Postnatal expansion of a CCAM with air or fl uid can create a surgical emergency due to compression of lung and cardiac tissue. Expansion by partial aeration of a thin-walled macrocystic lesion makes it diffi cult to distinguish on plain x-ray from congenital lobar emphysema, diaphragmatic hernia, or lung abscess. However, CT imaging usually reveals a CCAM’s characteristic cystic appearance.
Treatment: When discovered prenatally and of extensive size, CCAMs are occasionally treated by intrauterine aspiration to decrease cyst size or by fetal surgery to remove the mass (Fig. 37.9).Such interventions provide space for normal lung growth to resume. In the absence of hydrops fetalis, monitoring CCAM over time is preferred since some resolve spontaneously. Postnatally,
surgical resection of CCAM is often done because
lesions may become recurrently infected, and their aeration and expansion may further compromise surrounding lung tissue. Lobectomy has become the surgical therapy of choice to avoid post-resection air leaks when smaller tissue volumes are removed, but extensive CCAMs may require pneumonectomy.
Prognosis: Type 1 or macrocystic CCAMs generally have good surgical outcomes. Infants with microcystic or types 2 and 3 CCAM often have associated fetal hydrops, pulmonary hypoplasia, or other anomalies that signifi cantly worsen prognosis.
What is congenital lobar emphysema? Symptoms? Diagnostics? Treatment?
Congenital lobar emphysema is an idiopathic hyperinfl
ation of one or more lobes of the lung, excluding lesions
caused by extrinsic compression of the bronchus.
Symptoms: Most cases present in the fi rst 6 months of life with symptoms of respiratory distress, tachypnea, or cyanotic spells.
Diagnostics: On physical exam there are decreased breath sounds on the affected side, as found in other forms of emphysema (Chap. 14). Plain chest x-rays
reveal a characteristic hyperinfl ated lobe with decreased vascular markings. The hyperinfl ated lobe usually compresses surrounding lung tissue and often causes mediastinal shift. Although any lobe can be involved, the right middle and left upper lobes accounted for 74% of cases in one reported pediatric series. Chest CT imaging may be useful in differentiating diffi cult cases.
Treatment: Asymptomatic patients may be followed without intervention, while symptomatic patients undergo surgical resection that is essentially curative. In at least one study, however, surgery offered no signifi cant benefi t to long-term pulmonary function over medical management alone.