[Retroplacental hematoma and factor XI deficiency]

The authors report a case of premature separation of a normally located placenta at 28 weeks, associated with factor XI deficiency. The deficiency became known 6 weeks before the acute episode. In this particular case the deficiency did not occur in the context of congenital abnormalities, hepatocellular insufficiency nor any autoimmune disease. This rare case raises the problem of the role of a coagulation disorder in the etiopathogenesis of retroplacental hematoma.