title: Familial occurrence of 18q.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002869:Chromosome Aberrations / Q000235:genetics*; D025063:Chromosome Disorders; D002902:Chromosomes, Human, 16-18; D003582:Cytogenetics; D003878:Dermatoglyphics; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D007621:Karyotyping; D007713:Klinefelter Syndrome / Q000473:pathology; D008297:Male; D010375:Pedigree; D010641:Phenotype