Low-Level Trisomy 14 Mosaicism: A Carrier of an Isochromosome 14 and a Supernumerary Marker Chromosome 14

Full trisomy 14 in one of bichorionic biamniotic twins

We describe the case of the lethal full trisomy (T) 14 in a fetus from bichorionic biamniotic (BCBA) twin pregnancy. This is a case of a 28-year-old primigravida, with an unremarkable personal and family history, who just like her 30-year-old husband, was without consanguinity between spouses. She conceived spontaneously, without a burdened gynecological-obstetric history. By the 12th week of pregnancy, she had hyperemesis gravidarum and one episode of bleeding due to which progesterone supplementation was prescribed. Due to asymptomatic bacteriuria, she took cefuroxime axetil in the 13th week of pregnancy and azithromycin in the 15th week due to cervicitis with ureaplasma urealyticum.