Ring chromosomes are rare cytogenetic findings (prenatal frequency ~ 0.0075%) often associated with an abnormal phenotype, depending of the chromosomal origin, genetic content and the presence of a mosaic. Supernumerary ring chromosome 16 [r(16)] is rarely observed and mosaicism makes the genotype/phenotype correlation difficult. We report a de novo mosaic r(16) detected after prenatal diagnosis in a woman refe...
Introdução: O diagnóstico pré-natal (DPN) atempado de anomalias cromossómicas em fetos com anomalias ecográficas é fundamental no prognóstico da gravidez, ou na sua possível interrupção. Assim, a realização das ecografias fetais nas semanas preconizadas é determinante para a gestão dos casos anormais. Descrevemos um caso de uma gravidez mal vigiada, com ecografia fetal realizada às 29 semanas de gestação, onde ...
7q11.23 duplication syndrome is a multisystemic developmental disorder characterized by variable manifestations, such as speech delay, mild craniofacial anomalies with distinctive facial features, and intellectual ability ranging from mental retardation to normal cognitive development. Approximately 30% of individuals with 7q11.23 duplication have one or more congenital anomalies. Penetrance is complete with va...
Introdução: As mudanças no diagnóstico pré-natal de anomalias cromossómicas (DPN) nos últimos 10-15 anos foram contínuas e significativas. Objetivos: Propômo-nos analisar essa evolução: mudanças nas indicações clínicas; introdução das biópsias de vilosidades coriónicas (BVC); utilização do diagnóstico rápido de aneuploidias (DRA); estudos por microarray; alterações cromossómicas encontradas. Metodologia: Fez-se...
Loss of the Y chromosome (L0Y) is describe as a both a normal age – related event and a marker of a neoplastic clone in haematological diseases. In order to understand the relationship between L0Y chromosome and the different myeloid neoplasms, we retrospectively analysed cytogenetic results of 891 males’ patients, from 1995 to 2016 with myeloid neoplasms. Sixty one patients showed L0Y. Of the 61 patients witho...
A limited number of prenatal diagnosis (PND) cases have reported interstitial deletions of the long arm of chromosome 14 involving the 14q31-32 region. Those cases presented cardiac anomalies, urogenital anomalies, congenital diaphragmatic hernia, and mild pyelectasis. We report the PND of a 33-year-old pregnant woman, who underwent chorionic villus sampling at 12 weeks of gestation after a positive combined 1s...
Tetrasomy of the short arm of chromosome 9 is a rare chromosome imbalance that may result from a supernumerary isochromosome 9 with the most recurrent breakpoints being 9p10, 9q12 and 9q13. On ultrasound, it usually presents with intrauterine growth restriction (IUGR), abnormal facial profile and ventriculomegaly. However, few reports establish a correlation between fetal features and the size of isochromosome ...