Fluid on Baby's Brain - Am I alone?

Dear Friends,
My sister is in her 19th week and today she went for her scan and was told that the baby has fluid in the right brain (7 ml) and Dr says now-a-days this is quite normal and this problem would disappear during the 22nd week scan.

Though i convince her, she is really worried. Would be really great if you people could share your thoughts, experiences.

Also would need all your prayers for the baby and my sister.

Thanks everyone.

Regards,
Viji