Article D6124-140 of the French Public Health Code
The operating theatre has at least two operating theatres, one of which is permanently accessible and equipped for neurosurgery and the other may be shared. Where applicable, an additional room, equipped for performing functional neurosurgery or intracranial and extracranial radiosurgery under stereotactic conditions, is required when the authorisation specifies the implementation of the therapeutic practices mentioned in 1° and 2° of article R. 6123-100.