Trisomy 18 caused by isochromosome 18p and 18q formation: Is there a milder phenotype?

Trisomy 18 Caused by Isochromosome 18p and 18q Formation: Is There a Milder Phenotype? Giuseppe Maria Maruotti, Floriana Fabbrini, Raffaele Napolitano, Rita Genesio, Anna Conti, Giovanna Mallia Milanes, Laura Letizia Mazzarelli, and Pasquale Martinelli* Department of Gynecology and Obstetrics, University Federico II of Naples, Naples, Italy Prenatal Diagnosis Unit, University Federico II of Naples, Naples, Italy