Chorangiosis
Chorangiosis is a placental pathology characterized by an abundance of blood vessels within the chorionic villi. Associations
It is associated with gestational diabetes, smoking and high altitude. Diagnosis
It is diagnosed by a microscopic examination of the placenta. Commonly used criteria from Altshuler are: "a minimum of 10 villi, each with 10 or more vascular channels, in 10 or more areas of 3 or more random, non-infarcted placental areas when using a ×10 ocular." The Altshuler criteria are not theoretically rigorous, as they do not define the area. Normal villi have up to five vascular channels. See also
Chorangioma

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Health issues in pregnancy