RT Journal Article SR Electronic T1 Familial four breakpoint complex chromosomal rearrangement as a cause of monosomy 9p22-->pter and trisomy 10p11.2-->pter and 11q21 analysed by dual and triple colour FISH. JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 696 OP 699 DO 10.1136/jmg.34.8.696 VO 34 IS 8 A1 Stankiewicz, P A1 Kostyk, E A1 Bocian, E A1 StaƄczak, H A1 Parczewska, J A1 Piatkowska, E A1 Mazurczak, T A1 Pietrzyk, J J YR 1997 UL http://jmg.bmj.com/content/34/8/696.abstract AB A familial four breakpoint complex chromosomal rearrangement involving chromosomes 9, 10, and 11 was ascertained through a child with dysmorphic features, hypertrophic cardiomyopathy, and hypotonia. A cryptic insertion, invisible in G banded chromosomes was identified by fluorescence in situ hybridisation (FISH) using chromosome specific libraries. Possible mechanisms of its formation as well as karyotype-phenotype correlation are discussed.