Congenital malformations, deformities, and chromosomal abnormalities (Q00-Q99).
- Tracheomalacia (softening of the trachea).
Respiratory System (J00-J99)
- Acute bacterial tracheitis (inflammation of the trachea); typical pathogens: Staphylococcus aureus, Haemophilus.
- Epiglottitis (epiglottitis).
- Respiratory tract infections, unspecified
- Recurrent croup – typical causative agents/triggers: viruses, allergens, inhalant noxious agents; childhood (6 LM – 6th LY/peak 2nd LY).
Blood, blood-forming organs – immune system (D50-D90).
- Hereditary angioedema (or hereditary angioneurotic edema) – autosomal dominant inherited disorder with a tendency to develop angioedema/swelling of the subcutaneous tissues, especially the lips (special form of Quincke’s edema); the cause is C1 esterase inhibitor deficiency.
Infectious and parasitic diseases (A00-B99).
- Bacterial infections, unspecified
- Diphtheria (true croup)
- Viral infections, unspecified
- Childhood diseases such as rubella, measles, mumps, varicella (chickenpox) usually begin nonspecifically
Injuries, poisonings and other consequences of external causes (S00-T98).
- Foreign body aspiration (inhalation of foreign bodies); symptoms: inspiratory stridor (breathing sound during inhalation (inspiration); esp. in children) – Note: An interdisciplinary approach is always required when removing foreign bodies from the airways of children!
Further
- Allergic reactions, unspecified
Boldface: differential diagnoses of croup syndrome; the following conditions are assigned to it:
- Diphtheric croup (true croup) – typical pathogen: Corynebacterium diphtheriae; Note: occurrence at any age!
- viral croup – most common cause of acute dyspnea (shortness of breath) in childhood (6th month of life (LM) – 3rd year of life (LJ)); incidence: about 5% in the 2nd year of life.
- recurrent croup – typical causative agents/triggers: viruses, allergens, inhalant noxious agents; childhood (6 LM – 6th LY/peak 2nd LY).
- Bacterial laryngotracheitis – typical pathogens: Staphylococcus aureus, Haemophilus influenzae; occurrence: very rare; childhood (6th LM – 8th LJ/peak 6th LJ).
Legend
- LM: Month of life
- LJ: year of life
