A nine-year-old male with developmental abnormalities was found to be mosaic for an extra No. 9 chromosome (46,XY/47,XY,+9). The clinical findings included severe mental retardation, peculiar facies, short stature, hypotonia, dextroposition with a ventricular septal defect, and patent ductus arteriosus, as well as significant abnormalities of the brain.
Statistics from Altmetric.com
↵** Present address: Department of Pediatrics, University of Texas Medical School at Houston, Freeman Building, Texas Medical Center, Houston, Texas 77025, USA.
↵* This work was supported in part through project 917, Maternal and Child Health Service, Department of Health, Education, and Welfare.
Reprint requests to Dr R. H. A. Haslam, The John F. Kennedy Institute, 707 North Broadway, Baltimore, Maryland 21205, USA.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.