Hydrops Fetalis

Severe edema that develops before birth. The excess fluid collects in the body cavities, particularly in the peritoneal cavity (ascitis) and the pleural cavity.
which can be recognized by the USS.

The most common cause is severe anemia associated with hemolytic disease of the newborn.
It can also occur with a twin-to-twin transfusion.

Other causes are congenital heart diseases, kidney diseases and lung diseases.

Treatment
intra uterine blood transfusion to the fetus.

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Anencephaly

Anencephaly is a cephalic disorder that results from a neural tube defect that occurs when the cephalic (head) end of the neural tube fails to close, usually between the 23rd and 26th day of pregnancy, resulting in the absence of a major portion of the brain, skull, and scalp. Children with this disorder are born without a forebrain, the largest part of the brain consisting mainly of the cerebral hemispheres (which include the neocortex, which is responsible for higher-level cognition, i.e., thinking). The remaining brain tissue is often exposed—not covered by bone or skin.