disease arises from structure disease arises from alteration in structure chromosome 20 (Human) epilepsy ring chromosome 20 https://rarediseases.info.nih.gov/diseases/1334/ring-chromosome-20 https://www.malacards.org/card/ring_chromosome_20_syndrome SCTID:23686004 NANDO:1200597 GARD:0001334 UMLS:C0265482 chromosome 20 ring MONDO:0015436 Orphanet:1444 ring chromosome 20 syndrome ring 20 ring chromosome type 20 DOID:0070622 MEDGEN:489853 NCIT:C169001 Ring chromosome 20 syndrome is marked by a characteristic seizure phenotype. Depending on the amount of chromosomal loss and associated mosaicism, ring(20) can be associated with macrocephaly, mild to moderate intellectual deficit, or behavioral problems. In rare cases, brain, kidney or heart malformations may be present. R20 ICD9:758.89 MESH:C580424 chromosome 20 disorder ring chromosome disorder