PEDIATRICS Vol. 93 No. 2 February 1994, pp. 211-215
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Toluene Embryopathy: Delineation of the Phenotype and Comparison With Fetal Alcohol Syndrome

Margaret A. Pearson MD1, Mary E. Rimsza MD1, H. Eugene Hoyme MD2, and Laurie H. Seaver MD2

1 Department of Pediatrics and the Steele Memorial Children's Research Center, University of Arizona College of Medicine, Tucson, Department of Pediatrics, Maricopa Medical Center, Phoenix, AZ
2 Department of Pediatrics and the Steele Memorial Children's Research Center, University of Arizona College of Medicine, Tucson, AZ

Objective. To determine if maternal toluene abuse produces any structural or developmental disabilities in the developing fetus, a cohort of toluene-exposed infants was ascertained and examined.

Methodology. Eighteen infants with a history of in utero toluene exposure were examined at birth. Nine of these infants were reexamined 3 to 36 months after their initial evaluations. The clinical findings in these patients were compared with those of similarly exposed children from the literature and with patients who had the fetal alcohol syndrome.

Results. Thirty-nine percent of all toluene-exposed infants described in this and other studies were born prematurely, and 9% died during the perinatal period. Fifty-four percent were small for gestational age, and 52% exhibited continued postnatal growth deficiency. A 33% incidence of prenatal microcephaly, a 67% incidence of postnatal microcephaly, and an 80% incidence of developmental delay were observed. Eighty-three percent of the patients had craniofacial features similar to the fetal alcohol syndrome, and 89% of these children had other minor anomalies.

Conclusions. Data from the patients herein described and the available scientific literature suggest that the mechanism of alcohol craniofacial teratogenesis may be nonspecific, with a variety of teratogens, including toluene, giving rise to phenotypic facial abnormalities similar to those of the fetal alcohol syndrome. We propose a common mechanism of craniofacial teratogenesis for toluene and alcohol, namely a deficiency of craniofacial neuroepithelium and mesodermal components due to increased embryonic cell death.

Submitted on August 27, 1992
Accepted on July 13, 1993




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