[Massive subchorionic fibrin deposit: echographic diagnosis]

Intra-placental sub-chorionic fibrin deposition is a frequent finding but generally does not involve alterations of hemodynamics or the organ's gaseous metabolism. If the deposition is massive, as in the two cases reported here, delayed fetal growth may occur due to altered placental function. Diagnosis using ultrasound is useful both to identify fibrin plaques and to identify possible fetal hypo-development.