Inclusion Criteria:  Women aged 18 to 50 years hospitalized at Saint Joseph Hospital between 01/01/2016 and 12/31/2020 for VTE ICD-10 codes I26, I80, I82, O22.3, O22.5.  Exclusion Criteria:  Patient under guardianship or curatorship Patient deprived of liberty Patient under court protection Patient objecting to the use of his or her data for this research.