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Figure 1: Prenatal ultrasonography (US) imaging of the first fetus. (a) Abdominal US: the inner canthal distance (D1) is long and the outer canthal distance (D2) is normal. The orbital margin diameters (D3 and D4) are small. (b) Abdominal magnetic resonance imaging: anterior–posterior ocular diameters (D1 and D2) are small |
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