Intra-uterine growth retardation (IUGR) is a frequent cause of consultation in antenatal care unit. The prognosis relies on the etiology: vascular, chromosomic, genetic, or infectious. Because of chronic fetal distress, hypotrophy increase morbidity, mortality and neurosensorial long term effect. Usually, infection is involved in 5 to 15% of the IUGR, mainly by Cytomegalovirus (CMV), Varicella Zoster virus, rubella, toxoplasmosis, herpes and syphilis. Maternal sera and amniotic liquid analysis make the diagnosis possible but fetal ultrasound scan is used to find other features. Most of the abnormalities are unspecific but their combination can worsen fetal prognosis. Infection should always be ruled out in the assessment of IUGR.
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