The study hypothesis is that dilations of idiopathic bronchi are particularly common in French Polynesia, and that there are arguments in favour of an underlying genetic factor.

The study will retrieve retrospective data in the history of bronchial dilation, patients' personal and family history, microbiological and scannographic data, and the latest cardio respiratory checkup.

Inclusion Criteria:

• Polynesian patient
• Patient with bronchial dilation followed by Centre hospitalier de Polynesie Francaise or patient with bonchial dilation no longer consulting in the hospital over the study period Jan 1, 2010 to Dec 31, 2020

Exclusion Criteria:

• Expressed refusal to participate in the study for patients undergoing follow-up

500 patients with bronchial dilatation over the study period: Jan 1, 2010 to Dec 31, 2020