Bacterial ecology of pilonidal cysts Single centre retrospective exploratory study of medical data contained in the medical records of patients operated on in the centre between 01/08/2020 and 30/11/2020.

From the medical records of a series of patients treated for pilonidal cysts:

1. Describe the bacteriological analyses performed on a series of non-abscessed pilonidal cysts before laser treatment
2. Compare the bacterial flora of cysts operated on in the first instance and those reoperated on

This is a retrospective monocentric study of medical data contained in the medical records of patients operated on for pilonidal cysts and who received the same protocol:

• Antibiotic prophylaxis (injection of 2g of Augmentin)
• Treatment of the cyst by laser, under general anaesthesia, after dilatation of the pilonidal sinus, evisceration and bacteriological swabbing.
• Post-operative monitoring and local care

Inclusion Criteria:

• Patient aged 18 years or older,
• Patient who has been informed about the research;
• Patient with a pilonidal cyst treated with Holmium Laser during a scheduled procedure.

Exclusion Criteria:

• Patient under legal protection, guardianship or curatorship;
• Patient who has indicated his opposition to the use of his data;
• Patient undergoing emergency surgery for an abscess.

patients operated on for pilonidal cysts and who received the same protocol:

• Antibiotic prophylaxis (injection of 2g of Augmentin)
• Treatment of the cyst by laser, under general anaesthesia, after dilatation of the pilonidal sinus, evisceration and bacteriological swabbing.
• Post-operative monitoring and local care