A report is given of 8 cases of recurrent "idiopathic" abortions sharing in common the following features, unreported so far: (1) high uterine arterial impedance; (2) decrease in endometrial thickness, in spite of normal hormonal and endometrial cycle at biopsy; (3) a history of previous curettages. Such a syndrome could be consistent with the existence of a narrow peripheral symphysis of the uterine cavity, unaffecting its shape at hysterography.