Inclusion Criteria:  Patient with age ≥ 18 years Patient with supra-tentorial stroke treated by mechanical thrombectomy and who had MRI imaging on admission before endovascular treatment at Paris Saint-Joseph Hospital Complete MRI protocol including Diffusion and FLAIR sequences French-speaking patient  Exclusion Criteria:  Patient under guardianship or curatorship Patient deprived of liberty Patient under court protection Patient objecting to the use of his data for this research