Sensitivity of prenatal ultrasound for detection of trisomy 18

Trisomy 18: A Case Study

Trisomy 18 is the second-most common aneuploidy and greatly ranges in presentation. This case study examines the diagnostic procedures taken with an Amish woman’s Trisomy 18 pregnancy. The sonographic findings are examined and compared with typical presentations and cultural differences regarding obstetrical care plans. Current medical advances have altered prognoses and courses of treatment. This case study highlights the importance of patient-provider communication and the need for continuous amendment of information, within obstetrical care.

Enlarged cavum septi pellucidi Z-scores in fetuses with trisomy 18

Objective: We aim to establish a formula calculating the fetal cavum septi pellucidi (CSP) width Z-scores and compare CSP width between the normal fetus and 18-trisomy fetus.Methods: In this retrospective study, 608 normal fetuses and 71 fetuses with the 18-trisomy syndrome were included. Z-scores were calculated after the acquisition of CSP images. Normal CSP width Z-scores formulae were constructed based on gestational age (GA) by performing a standard regression analysis followed by weighted regression of absolute residual values. Subsequently, the Mann-Whitney U test was used to compare the CSP width Z-scores between normal and 18-trisomy groups.Results: Formulae calculating CSP width Z-scores were constructed. Normal fetal CSP width was significantly correlated with GA (R² = 0.50, p < .01). In 18-trisomy group, 69% (34/49) fetuses displayed enlarged fetal CSP width and CSP width Z-scores (p < .01).Conclusions: The CSP width Z-scores formulae established in the current study can provide a quantitative basis for the prenatal diagnosis of 18-trisomy syndrome. Enlarged CSP width Z-score may serve as a novel prenatal diagnostic marker for the 18-trisomy syndrome.