What is a bronchial cyst? Is it serious? What are the symptoms and how does it show up on CT? What are the symptoms, CT findings, and can it become cancerous? What is bronchial cyst? Tracheal and bronchial cysts are congenital developmental anomalies. During the development of embryonic trachea and bronchus, if some of the cells are detached from the laryngotracheal groove, tracheal and bronchial cysts can be formed, which are often located in the middle mediastinum or the posterior mediastinum, and usually do not communicate with the bronchus. Second, what are the symptoms of bronchial cysts? Tracheal and bronchial cysts are the most common cysts in the mediastinum, accounting for 34% of primary mediastinal cysts. They can develop at any age. 2/3 of patients are asymptomatic, but if the cysts are large, they can produce compression symptoms, including chest pain, dyspnea, cough, wheezing, or dysphagia. If the cyst is large, it can produce compression symptoms, including chest pain, dyspnea, cough, wheezing or dysphagia. When the cyst is hemorrhaging, infected and connected to the bronchial tubes, hemoptysis and coughing up sputum can occur. Third, what is the CT manifestation of bronchial cyst? CT scan shows that the cyst is located in the paratracheal tube, under the bulge, the density of the cyst is uniform, and the edge is sharp. Does bronchial cyst need surgery? If it is clear that it is a bronchial cyst, follow-up observation can be taken to avoid unnecessary tracheoscopic puncture, which may cause mediastinal infection. Patients with obvious symptoms can consider surgical resection, and can choose single-port thoracoscopy to remove the cyst. Surgical resection can not only clarify the diagnosis and alleviate the symptoms, but also prevent the occurrence of related complications. Bronchial cysts are generally not cancerous.