Cystic hygroma and hydrops fetalis in a fetus with trisomy 13

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Abstract
A case of trisomy 13 is reported with cystic hygroma and generalized hydrops fetalis diagnosed prenatally by routine ultrasound prior to genetic amniocentesis in a 34-yr-old women. Although fetal cystic hygroma is usually associated with a 45,X karyotype, this and other previous reports suggest that it may be seen in association with other chromosomal and nonchromosomal abnormalities as well. A diagnosis of Turner Syndrome should not be made on the basis of a cystic hygroma observed by prenatal sonography alone.