title: Supernumerary small chromosomal anomaly: report of three cases including one with a familial inversion of chromosome 5.
abstract: Three cases of a small supernumerary chromosomal anomaly of essentially unknown origin associated with wide variability of clinical expression are reported. Case II has, in addition, a pericentric inversion of chromosome 5, which enables us to propose a mechanism, involving an unsuccessful crossing over, for the origin of the supernumerary chromosome.
mesh_terms: D002648:Child; D002869:Chromosome Aberrations; D002871:Chromosome Banding; D025063:Chromosome Disorders; D002904:Chromosomes, Human, 21-22 and Y; D002905:Chromosomes, Human, 4-5; D005260:Female; D006801:Humans; D007223:Infant; D008607:Intellectual Disability / Q000235:genetics*; D008297:Male; D010641:Phenotype; D014314:Trisomy