Pneumothorax is characterized by an abnormal presence of air in the pleural cavity, that is to say between the two layers of the pleura, the membrane that surrounds the lungs and lines the rib cage. "The patient is usually seized with sudden chest pain and difficulty in breathing.

In this retrospective research, the investigators wish to carry out an inventory of the management of spontaneous pneumothorax in adolescents within the University Hospitals of Strasbourg

Inclusion criteria:

• Adult patient (18-20 years old)
• Minor patient aged 14-17 years old
• Any gender
• Spontaneous pneumothorax without apparent cause, between 14 and 20 years old
• Patient operated on at the HUS between 2010 and 2021
• Patient not objecting to the reuse of their data for scientific research purposes.
• Holders of parental authority who do not object to the reuse of their child's data for scientific research purposes.

Exclusion criteria:

• Patient who has expressed his opposition to the reuse of his data for scientific research purposes.
• Holders of parental authority who have expressed their opposition to the reuse of their child's data for scientific research purposes.
• Secondary origin of the pathology: Cystic fibrosis, postoperative pneumothorax, post-traumatic,
• Subject having been treated initially in another structure without further information.

Patient (aged between 14-20 years old) having pontaneous pneumothorax without apparent cause and operated on at the HUS between 2010 and 2021.