Neurological impairment of the monozygotic twins with congenital infection presumed by Zika virus: Case report

Abstract Introduction: the increase in the incidence of congenital microcephaly in Brazil has been associated to the Zika virus outbreak. This case report aimed to describe the neurological impairment of monozygotic twins presumably due to an intrauterine infection by Zika virus during the Brazilian outbreak in 2015. Case description: The monozygotic twins born at term with severe congenital microcephaly were taken to the Outpatient Pediatric Service of a University Hospital. The 17-yearold mother, primigravida, lives in the Northeast region of Brazil, has a normal body mass index, no family history of microcephaly, no clinical history of viral diseases, or exposure to drugs and/or radiation during pregnancy. Serological tests for toxoplasmosis, rubella, syphilis, cytomegalovirus and HIV were negative at the prenatal evaluation and the obstetrical ultrasounds showed a monochorionic, diamniotic twin pregnancy without any evidence of neurological abnormalities. In the post-natal, the imaging of the skull, was evidenced of a great neurological impairment in one of the twins, who, in addition to presenting cerebral calcifications, gliosis and subependymal cysts, also had ventriculomegaly with hydrocephalus of supratentorial predominance and more pronounced cerebral atrophy compared to the other twin. Both presented delayed neuropsychomotor development. Discussion: distinct neurological alterations in the monochorionic twins with an infection presumed by Zika virus may raise the hypothesis of the existence of predisposing factors or protection against this viral agent.