Altshuler criteria: "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."[1][2]
Notes:
Normal villi have up to five vascular channels.[2]
The Altshuler criteria are not theoretically rigorous, as they do not define the area.
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Intermed. mag.
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References
↑ (Jan 1984). "Chorangiosis. An important placental sign of neonatal morbidity and mortality.". Arch Pathol Lab Med108 (1): 71-4.
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