The goal of this observational study is to evaluate the recurrence rate after laser treatment of pilonidal sinus within two years of the procedure in adult patients who require this procedure to treat their pilonidal sinus.

The main question it aims to answer is:

• Is there a clinical recurrence (presence of a fistula in the intergluteal cleft) 2 years after laser treatment of pilonidal sinus? Participants who undergo surgery as part of their regular medical care will answer survey questions about recurrence at 1 and 2 years.

Inclusion Criteria:

• Patients requiring laser surgery for pilonidal sinus, of any type (including recurrence after radical cure or laser treatment)
• Patient able to understand the protocol and having given written informed consent to participate in the study,
• Patient affiliated to the social security system or entitled to it.

Exclusion Criteria:

• Patient participating in another interventional clinical research protocol involving a drug or clinical investigation of a medical device
• Patient already included in a research study
• Patient under guardianship, conservatorship, or deprived of liberty
• Patient under an activated future protection mandate
• Patient under family authorization
• Patient under judicial protection.

The study will be conducted in two centers that regularly perform laser treatment for pilonidal cysts.

Recruitment will be conducted prospectively upon the patients' arrival at the digestive surgery department.