this report presents the cytogenetic findings (g -banded chromosomal analysis} in 383 cases referred for suspected chromosomal abnormalities because of abnormal clinical features. chromosomal aberrations were found in 63 116.5%) of these cases, free trisomy 21 (7%) being the most common abnormality , followed by 47, xxykaryotype (4%). the breakdown figures for each group is discussed in the text.

fibrous dysplasia (fd) is an osseous growth dis-order, producing immature bone and characte-rized by the replacement of normal bone with fibro-osseous connective tissue. it is a bone dys-plasia that has the potential to cause significant cosmetic and functional disturbances, particularly in the craniofacial skeleton. cra-niofacial fibrous dysplasia is one of the three types of polyostotic fibro...

background chromosomal aberrations are one of the most common causes of mental retardation (mr). objectives in this study, in order to identify the rate of chromosomal abnormalities in idiopathic mr, 50 mr patients at a charity center in hamadan, iran, were investigated. methods fifty mentally retarded male patients without specific chromosomal abnormalities (e.g., down syndrome, fragile x synd...