Medical Definition of chorioangioma
: a benign vascular tumor of the chorion Chorioangiomas occur in up to 1 percent of pregnancies, but those associated with nonimmune fetal hydrops are usually more than 5 cm in diameter and should have been visible on prenatal ultrasonograms or in the placenta at delivery.— Linda J. Heffner et al., The New England Journal of Medicine, 24 July 1997
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