anencephaly hydranencephaly https://www.malacards.org/card/hydranencephaly Hydroanencephaly NCIT:C98949 MESH:D006832 UMLS:C0020225 icd11.foundation:1963574608 HP:0002324 A rare congenital brain disorder in which the cerebral hemispheres are absent and replaced by sacs that contain cerebrospinal fluid. Signs and symptoms include irritability, increased muscle tone, seizures, and hydrocephalus. The prognosis is poor. hydranencephaly (disease) GARD:0006681 NORD:1258 hydranencephaly (disease) MONDO:0016344 MEDGEN:6937 SCTID:30023002 hydranencephaly Orphanet:2177 DOID:4626 encephaloclastic disorder