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A fluid filled sac on the surface of the ovary is called a(n)

User Emma Ray
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Do you mean the amniotic cavity? The amniotic cavity is the fluid filled space that is between the amniotic sac and the embryo. I don't know if this is what you mean, but that's all i could think of.
User Cancan
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It is called a cyst. 
User Tariqdaouda
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