The supernumerary isochromosome 18 syndrome (+ 18pu).
D002675:Child, Preschool; D002869:Chromosome Aberrations / Q000175:diagnosis / Q000000981:diagnostic imaging; D025063:Chromosome Disorders; D002902:Chromosomes, Human, 16-18; D003878:Dermatoglyphics; D002658:Developmental Disabilities; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D007621:Karyotyping; D008297:Male; D008423:Maternal Age; D008856:Microscopy, Fluorescence; D010641:Phenotype; D011859:Radiography; D013577:Syndrome