Plastic bronchitis (PB) is a rare acute respiratory disease characterized by the formation of fibrin-rich plugs leading to airway obstruction and respiratory failure. This is due to the organization of the exudate, or transudate, which takes the form of the airways. Mortality in BE reaches 28-60% in patients with congenital heart disease (CHD) and 6-7% among other causes. Exact epidemiological data are unknown. In most patients, BE occurs in the context of underlying diseases, which can be conditionally divided into two groups: diseases of the heart and blood vessels and a secondary complication of pulmonary diseases. Clinical manifestations of PB are manifested by episodes of dyspnea, tachycardia, hypoxia, fever, and cough associated with airway obstruction. All existing treatments are symptomatic. The article presents a clinical case of the development and course of PB in a girl aged 1 year and 10 months against the background of acute community-acquired right-sided segmental (S10) pneumonia.