Anatomical findings: upper and lower airways · 2019. 4. 30. · Ernst Eber, MD, ATSF, FERS Division of Paediatric Pulmonology and Allergology, Dept of Paediatrics and Adolescent
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Ernst Eber, MD, ATSF, FERS
Division of Paediatric Pulmonology and Allergology, Dept of Paediatrics
and Adolescent Medicine, Medical University of Graz, Austria
Anatomical findings: upper and lower airways
(normal/abnormal)
Cairo, 28 April 2019
• Nasal cavity
• Pharynx
• Larynx
• (Extrathoracic) trachea
Upper airway
Upper airway
Wallis C. Normal anatomy. In: Priftis KN, Anthracopoulos MB, Eber E, Koumbourlis AC, Wood RE (eds). Paediatric Bronchoscopy. Prog Respir Res. Basel, Karger 2010
• Choanal atresia and stenosis
• Cysts, mass lesions
• Adenoids
Nasal cavity/nasopharynx
• Defective formation of definitive choanae (uni- vs.
bilateral; bony vs. membranous occlusion – 9:1)
• 2/3 with associated anomalies (e.g. CHARGE syndrome)
• Bilateral atresia – respiratory distress at birth
Unilateral lesions – detected later in childhood
• Diagnosis: Flexible endoscopy / CT scan
• Treatment: Establishment of nasal airway
Choanal atresia and stenosis
Lowe et al. Radiographics 2000
Choanal atresia and stenosis
Normal choanae of a 33 weeks newborn
Bilateral choanal atresia, post surgery in a 37 weeks newborn
Eber. Pädiatrische Pneumologie. Berlin Heidelberg, Springer, 2014
Choanal atresia and stenosis
Cysts, mass lesions
Dinwiddie Paediatr Respir Rev 2004
Adenoids
Courtesy of P. Pohunek
• Pierre Robin sequence
• Dysmorphic syndromes with maxillary or mandibular
hypoplasia, e.g. Apert, Crouzon, Goldenhar, Pfeiffer,
Treacher Collins syndromes
Often associated with other malformations, e.g. cleft palate
• Neuromuscular diseases/neurologic impairment with loss of
pharyngeal muscular stability pharyngeal collapse
• Base of tongue mass
Oropharynx
• Mandibular micrognathia, glossoptosis, and resultant (pharyngeal) airway obstruction
• Incidence: ~1:8,500-14,000; >50% with associated anomalies (>40; e.g. Stickler syndrome or 22q11.2 deletion syndrome); frequently cleft palate
• Variable severity of airway obstruction
• Treatment: In severe cases intubation; nasopharyngeal airway; noninvasive respiratory support; surgical procedures (mandibular distraction osteogenesis, tracheostomy); palatal plates (e.g. preepiglottic baton plate with velar extension)
(Pierre) Robin sequence
Evans et al. Pediatrics 2011
(Pierre) Robin sequence
Evans et al. Pediatrics 2011
(Pierre) Robin sequence
• Thyroglossal duct cyst
• Mucus retention cyst
• Lingual thyroid
Symptoms: Stridor, respiratory distress,
feeding difficulties/aspiration
May be intermittent!
Base of tongue mass
Base of tongue mass
Larynx
• Malacia (infantile larynx)
• Subglottic stenosis (congenital,
acquired)
• Vocal cord paralysis (uni-, bilateral)
• Haemangioma, lymphangioma
• Saccular cyst, laryngocele
• Web
• Cleft
• Papillomatosis
• Foreign body
Larynx
Stridor
• Often the most prominent symptom of UAO
• Heard predominantly during inspiration
• Indicative of substantial narrowing or obstruction
of the larynx or extrathoracic trachea
• increased velocity and turbulence of airflow,
vibration of the aryepiglottic folds or vocal cords
• Patients with more than 50% obstruction may be
asymptomatic!
Wood Pediatr Clin North Am 1984
... is visible
Eber et al. Wien Klin Wochenschr 1995
Indikationen
De Blic et al. Eur Respir J 2002
Persistent stridor
In 14-26% of patients with persistent stridor,
significant additional lower airway
abnormalities, or two or more synchronous
airway lesions may be detected.
Wood Pediatr Clin North Am 1984
Gonzalez Ann Otol Rhinol Laryngol 1987
Eber Monatsschr Kinderheilkd 1996
• Most common congenital laryngeal anomaly and
most common cause of persistent stridor in infancy
• Specific disease state with ill-defined pathogenesis
(specific aetiology still obscure)
• Anatomical abnormality or delayed development in
neuromuscular control?
• Worsened by application of lidocaine
Nielson Am J Respir Crit Care Med 2000
Laryngomalacia
• Frequently associated with other airway lesions and GER
• Onset of stridor within 4-6 weeks of life; cry & cough normal
• Stridor varies with posture & airflow, loudest with increased ventilation (e.g. crying, agitation, feeding)
• Stridor tends to resolve with time
• Diagnosis: History & physical examination, confirmed by flexible airway endoscopy
• Treatment: In most cases, no specific therapeutic measures needed. In severe cases (failure to thrive and/or obstructive apnoeas), surgical treatment (supraglottoplasty, rarely tracheostomy)
Laryngomalacia
Laryngomalacia – Types
Eber et al. ERS Handbook Paediatric Respiratory Medicine 2013
Laryngomalacia – Types
van der Heijden et al. Pediatr Pulmonol 2015
Laryngomalacia
Grading
Myer Ann Otol Rhinol Laryngol 1994
Symptoms:
Stridor, respiratory distress
Recurrent / atypical croup
Prognosis:
Depending on grade of stenosis
Stenosis may improve with
airway growth
Subglottic stenosis
Subglottic stenosis
Types
a) congenital
- membraneous (thickening of the soft tissues in the
subglottic area - symmetrical narrowing; common)
(endoscopic appearance may resemble subglottic edema)
- cartilagineous (malformation of the cricoid
cartilage - circumferential stenosis/variable
appearance; rare)
Types
b) acquired
- Majority of subglottic stenoses
- Etiology: Trauma (tracheal intubation pressure necrosis; tracheostomy)
- Ulcerations, granulation tissue, subglottic cysts
- Endoscopic appearance is usually irregular, not symmetrical
Subglottic stenosis
Subglottic stenosis
Subglottic oedema
Causes
Infection: croup, bacterial tracheitis
Allergy
Trauma: laryngeal foreign body
thermal injury
iatrogenic: tracheal intubation,
bronchoscopy (most common complication of
rigid bronchoscopy)
• Subglottic space swollen, symmetrically narrowed
• Airway sometimes slit-like
• Mucosa may appear inflamed
• Glottic shape preserved
Subglottic oedema
Types
• Isolated – associated with malformations
• Unilateral – bilateral
• Adductor – abductor paralysis
• Symptoms: Aphonia, feeding
difficulties/aspiration; hoarseness,
stridor, respiratory distress
Vocal cord paralysis
• Most common tumor in infancy
• Supraglottic - subglottic
• Asymmetric mass, endoscopic recognition
may be difficult
• Often rapid growth until 6-10 months
• Involution usually begins at ~18 months
• Symptoms: Stridor, respiratory distress
Recurrent/atypical croup
Haemangioma
Eber Paediatr Respir Rev 2004
Haemangioma
• Usually supraglottic
• 2 types: anterior, lateral
• Symptoms: Stridor, respiratory distress
Dysphagia/aspiration
Weak cry or aphonia
Laryngeal cyst
Types
• Supraglottic - glottic - subglottic
• Thick - membranous
• Complete - incomplete
Symptoms: Hoarseness, aphonia,
stridor, respiratory distress
Laryngeal web
Eber. Pädiatrische Pneumologie. Berlin Heidelberg, Springer, 2014
Laryngeal web
• May extend inferiorly into the trachea
• May be associated with other anomalies
of larynx, trachea, or oesophagus
Symptoms: Stridor, feeding difficulties/
aspiration
Laryngeal cleft
Laryngeal cleft
Eber et al. ERS Handbook Paediatric Respiratory Medicine 2013
Laryngeal papillomatosis
• Multiple irregular masses, most
commonly on the vocal cords
• May extend into the trachea and bronchi
Symptoms: Hoarseness, stridor,
respiratory distress
Atypical croup
Age less than 6 months
Prolonged symptoms
No response to treatment
Vocal Cord Dysfunction (VCD) or Inducible Laryngeal Obstruction (ILO)
• Inappropriate vocal (and false)
cord adduction during inspiration
or during both inspiration and
expiration
• Gastro-esophageal reflux may play
a causative role
Courtesy of. P Pohunek
• (Intrathoracic) Trachea
• Bronchial tree
Lower airway
Murray JF. The Normal Lung. 1986
Lower airway
Lower airway
Holinger LD, Lusk RP, Green CG (eds). Pediatric Laryngology & Bronchoesophagology. Lippincott-Raven 1997
Lower airway
Wallis C. Normal anatomy. In: Priftis KN, Anthracopoulos MB, Eber E, Koumbourlis AC, Wood RE (eds). Paediatric Bronchoscopy. Prog Respir Res. Basel, Karger 2010
Wallis C. Normal anatomy. In: Priftis KN, Anthracopoulos MB, Eber E, Koumbourlis AC, Wood RE (eds). Paediatric Bronchoscopy. Prog Respir Res. Basel, Karger 2010
• Trachea
Lower airway
Courtesy of P. Pohunek
• Right mainstem bronchus
Lower airway
Courtesy of P. Pohunek
• Right upper lobe bronchus
Lower airway
Courtesy of P. Pohunek
• Right intermediate bronchus
Lower airway
Courtesy of P. Pohunek
• Right lower lobe bronchus
Lower airway
Courtesy of P. Pohunek
• Left mainstem bronchus
Lower airway
Courtesy of P. Pohunek
• Left upper lobe bronchus
Lower airway
Courtesy of P. Pohunek
• Left lower lobe bronchus
Lower airway
Courtesy of P. Pohunek
• Incidence: ~1 in 2,000
• Weakness of the airway wall, due to reduction and/or
atrophy of the longitudinal elastic fibres of the pars
membranacea, or impaired cartilage integrity („immaturity“)
Airway more susceptible to collapse
Retention of secretions from the lower airways
Bronchopulmonary infections
• No generally accepted definition of degree of collapse to be
taken as abnormal
Tracheomalacia
Congenital airway malacia
Holinger et al. Pediatric Laryngology & Bronchoesophagology 1997
Rohde et al. Acta Paediatr 2006
Inspiration Expiration
Eber. Pädiatrische Pneumologie. Berlin Heidelberg, Springer, 2014
Intrathoracic tracheomalacia
Bronchomalacia
• congenital - acquired
• localised - generalised
• primary - secondary
Tracheomalacia and bronchomalacia
Types
• Congenital type
• Extrinsic compression type
• Acquired type
Severity
• Mild airway collapse < 70%
• Moderate airway collapse 70-90%
• Severe airway collapse > 90%
Major airway collapse
Mair and Parsons Ann Otol Rhinol Laryngol 1992
F.B., male, 7 yrs, primary tracheomalacia
"Persistent wheezing"
Flow-volume curve in a patient with tracheomalacia
Airways and vascular anomalies
Holinger LD, Lusk RP, Green CG (eds). Pediatric Laryngology & Bronchoesophagology. Lippincott-Raven 1997
Secondary tracheomalacia - double aortic arch
M.A., male, 7.8 yrs, persistent wheezing
Secondary tracheomalacia – pulmonary artery sling
L.K., female, 15.1 yrs, recurrent wheezing
Secondary tracheomalacia – innominate artery
• Incidence: 1 in 3,000 (-4,000)
• ~30% born prematurely
• ~50% with associated anomalies (e.g. VACTERL association)
• >50% with structural anomalies of the tracheal wall (i.e. tracheomalacia)
Wailoo and Emery. Histopathology 1979: In the majority of patients reduced circumference of tracheal cartilage and widened membranous part (normal 4-5:1)
Tracheo-oesophageal fistula
• Various types; most common type (~85%) with
upper blind pouch and fistula between the lower trachea and the lower oesophagus
Tracheo-oesophageal fistula / oesophageal atresia
Laberge and Puligandla. Congenital malformations of the lungs and airways.
In: Taussig, Landau, (eds.) Pediatric Respiratory Medicine. Mosby Elsevier, 2008
• Incidence: 1 in 80,000 (-90,000)
• Commonly not associated with other anomalies
• Usually, fistula located in the extrathoracic trachea
• Diagnosis: (Rigid) endoscopy, contrast injection
Isolated tracheo-oesophageal fistula (H-type)
• Short-segment stenosis (incl. tracheal webs and cysts)
hourglass-shape
• Long-segment stenosis
“stovepipe trachea”
funnel- or carrot-shape (“rat-tail trachea”)
• Frequently associated with other anomalies (pulmonary artery sling, abnormal bronchial arborisation, single right or left lung)
Congenital tracheal stenosis
Speggiorin et al. Ann Thorac Surg 2012
Congenital tracheal stenosis
Eber et al. ERS Handbook Paediatric Respiratory Medicine 2013
Eber. Pädiatrische Pneumologie. Berlin Heidelberg, Springer, 2014
Congenital tracheal stenosis
Etiology
• Endotracheal tube
• Tracheotomy tube
• Improper tracheotomy
Prevention!
Acquired tracheal stenosis
Tracheal bronchus
Intraluminal mass lesions
Courtesy of P. Pohunek
Tracheal wall granulomas, suction trauma
Suprastomal granulation tissue
Tumors – airway compression
Tracheobronchomegaly
Benesch et al. Pediatr Pulmonol 2000
Know normal to recognize abnormal
Thank you for your attention!
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