Massive perivillous fibrin deposition (MFD) and maternal floor infarction (MFI), 13.5 x 3.5 x 2 cm. in size, involving about 20% of maternal floor surface. Note: (Extensive chronic intervillositis (CI) is also noted in this case. Please see the Case #9110 )

Chronic intervillositis (CI) and massive perivillous fibrin deposition (MFD), together with its related entity, maternal floor infarction (MFI), are rare and poorly understood placental lesions. Both MFD/MFI and CI are associated with poor fetal outcome and high risk of recurrence. We report a patient who was found to have both MFD and CI in the same placenta, resulting in severe intrauterine fetal growth restriction and intrauterine fetal death at 37 weeks of gestation. Characteristic histological findings included both very extensive perivillous deposition of fibrinoid material and a heavy infiltrate of CD68-positive macrophages/monocytes in the maternal intervillous space. To our knowledge, this is the first time the co-occurrence of MFD and CI is reported in the literature.

Weber MA, Nikkels PG, Hamoen K, Duvekot JJ, de Krijger RR. Co-occurrence of massive perivillous fibrin deposition and chronic intervillositis: case report. Pediatr Dev Pathol. 2006 May-Jun;9(3):234-8.