Hemihydranencephaly is a rare brain malformation that affects infants. It is a condition where one-half of the brain is missing, and the other half is filled with fluid. Due to its uncommon occurrence, it may be challenging to find synonyms for this medical term. However, some words that could describe or relate to hemihydranencephaly could be brain damage, cerebral atrophy, encephalomalacia, and brain hypoplasia. These words may not be exact synonyms, but they share common characteristics with the condition. It is essential to understand the medical terminology associated with hemihydranencephaly for better communication and comprehension with medical professionals.