Pleurostrain: Interest of Strain Ultrasound in the Diagnosis of Pneumothorax

Inclusion Criteria: * Age over 17 years old * Management in an investigative centre * Presenting a suspicion of pneumothorax * Having had a pulmonary ultrasound scan * Having had a CT scan within 2 hours after or before the pulmonary ultrasound Exclusion Criteria: * Pregnant or breastfeeding women * Persons not covered by a social security scheme * Persons deprived of their liberty * The patient is participating in another study * The patient is in an exclusion period determined by a previous study * The patient is under the protection of justice, guardianship or curatorship * Patient refuses to participate * It is impossible to give informed information about * The patient does not read French fluently * Patient with any known pulmonary pathology pre-existing prior to the hospitalization episode * Patient with a lung condition other than pneumothorax on a scanner