During this exceptional health crisis, this study of the current care of a neurosurgical activity, which is essential in a University Hospital Centre, will enable us to better understand how we function, the response given to a population with the means at our disposal, the implementation of new therapeutic strategies and their limits, ethical reflection, and, how to pursue a distributive and quality medicine.

The restriction of conventional medical resources to our care activity (resuscitation, personnel, operating theatre, constraints linked to the risk of contamination...) is leading to a new medical organisation imposing new Covid-19 standards, the description of which seems essential to us.

A knowledge of the strategies to be adopted during a disaster health situation in order to continue providing care to the civilian population. How can we prevent the setting up of health care systems outside the cause of the health crisis? n triage medicine, Avoiding the "burn-out" of doctors struck by the health crisis.

Inclusion Criteria:

• Patient aged over 18;
• Entering the neurosurgery care sector requiring support between 03/16/2020 and 06/15/2020;
• Having not expressed his opposition, after information, to the reuse of his data for the purposes of this research.

Exclusion Criteria:

• Subject having expressed opposition to participating in the study
• Subject under guardianship or guardianship
• Subject under safeguard of justice

Patient entering the neurosurgery care sector requiring treatment between 03/16/2020 and 06/15/2020