Inclusion Criteria:  Patients:  Person who did not oppose to their inclusion in the trial Head trauma, patient operated on for an intracranial lesion, or other condition (hemorrhagic stroke...) requiring monitoring of ICP by a subdural or epidural sensor. Age > 18 years old  Controls:  Person who did not oppose to their inclusion in the trial Age > 18 years old No otologic or neurological history.  Exclusion Criteria:  Person subject to a measure of legal protection (curatorship, guardianship) Person under judicial control Pregnant, parturient or breastfeeding woman Minor Fracture of the petrosal bone, abnormality of the bilateral middle or inner ear or canal preventing tympanometry