chorioangioma
noun
cho·rio·an·gi·o·ma
-ˌan-jē-ˈō-mə
plural chorioangiomas also chorioangiomata
-mət-ə
: 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
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Merriam-Webster unabridged
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