disease arises from structure disease arises from alteration in structure chromosome 18 (Human) ring chromosome 18 https://rarediseases.info.nih.gov/diseases/6077/ring-chromosome-18 https://www.malacards.org/card/ring_chromosome_18 Orphanet:1442 Ring chromosome type 18 Chromosome 18 Ring R18 chromosome 18 ring GARD:0006077 SCTID:88154004 Ring chromosome 18 syndrome MEDGEN:539285 UMLS:C0265475 MONDO:0015434 Ring 18 Ring chromosome 18 syndrome is an autosomal anomaly characterized by variable clinical features, most commonly including hypotonia, neonatal feeding and respiratory difficulties, microcephaly, global developmental delay and intellectual disability, growth hormone deficiency, hypothyroidism, hearing loss, aural atresia, dysmorphic facial features and behavioral characteristics. NORD:943 MESH:C538304 ring chromosome disorder chromosome 18 disorder