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Aim: Holoprosencephaly (HPE) is the most common brain malformation. A wide spectrum of anatomical variants are characterized by a lack of midline separation of the cerebral hemispheres. The aim of this study was to assess the ultrasound diagnostic criteria for HPE., Material and Method: A database of 175 fetuses with central nervous system anomalies identified by ultrasound was collected retrospectively from 2006 to 2016 in this multicenter, retrospective, observational study. Among them 18 cases (10.2%) with HPE were identified., Results: The prevalence of HPE was 2.5:10.000 with the sex distributionmale:female of 1:1.6. Six cases were alobar subtype, 3 were semilobar, 7 were lobar and 2 were middle interhemispheric variant. In the second trimester, we consider that the abnormal fusion of the lateral ventricles and the absence of the cavum septum pellucidum are the most important landmarks for HPE. Facial abnormalities varied considerably., Conclusion: This study illustrates the heterogeneity of HPE with different cerebral and facial appearances.

Rationale: Holoprosencephaly is a structural malformation of the brain that results from the complete or incomplete noncleavage of the forebrain of the embryo into 2 hemispheres. We report a severe case of alobar holoprosencephaly diagnosed at 38 weeks, associated with cebocephaly, microcephaly, and craniosynostosis., Patient Concern: The main knowledge added by this case is the late ultrasound diagnosis and chromosomal analysis that revealed a very rare abnormality (45X/46,XX/47,XX) with mosaicism at chromosome 18., Diagnoses: Investigation of the mother revealed nothing remarkable from clinical point of view and on laboratory tests. Ultrasonography identified a fetal biometry appropriate for gestational age, except for the head biometry and abdominal circumference, that were appropriate for less than the fifth percentile. Microcephaly, a large midline monoventricle, absent midlinestructures, cleft lip, cebocephaly (hypotelorism, single-nostril nose), ethmocephaly (hypotelorism, interorbital proboscis) and craniosynostosis, were also present. Fetal magnetic resonance imaging of fetus revealed an absent midline structure, a central monoventricle, abnormal corpus calosum, and abnormal gyri., Interventions: A cesarean section at 38 weeks was indicated for fetal bradycardia and a female baby was delivered, with Apgar score 6, weight 2290g. After birth, the diagnosis of the fetus confirmed holoprosencephaly with facial anomalies and demonstrated repeated tonic-clonic seizure, severe respiratory failure, cyanosis, decreased muscle tone, palor, and apnea. Laboratory examination of the newborn revealed acidosis and a prolonged of prothrombin time. The neonate was treated for severe respiratory distress syndrome, with immediate intubation and resuscitation. Vitamin K, fresh frozen plasma, and antibiotics were also administered., Outcomes: After delivery, exitus of the fetus occurred at 3 days and 18hours due to massive pulmonary hemorrhage., Lessons: We described a case of alobar holoprosencephaly diagnosed at 38 weeks of gestation and associated with a rare chromosomal abnormality (45X/46,XX/47,XX) with mosaicism at chromosome 18. Emotional implications could have been less severe if the patient underwent regular ultrasonography allowing a diagnosis in the first or early second trimester.