Multiple gestation pregnancies are most often detected in the first trimester. Sometimes a point-of-care US may have been performed. At the time of this evaluation, the most important assessments include ascertaining the location of the pregnancy, identifying the number of gestational sacs, and determining the chorionicity and amnionicity [24]. An NT sonogram performed between 11 and 14 weeks has been incorporated into many practices. If not previously imagined, multiple gestations can sometimes be detected on that examination. MRI Fetal Without and With IV Contrast Fetal MRI without and with intravenous (IV) contrast is not useful as an initial imaging modality for the evaluation of known or suspected multiple gestations. Gadolinium contrast administration is avoided during pregnancy and is used only in exceptional circumstances. There is no relevant literature regarding the use of fetal MRI without and with IV contrast in these patients. Sometimes a gestational sac may be identified incidentally during imaging for other reasons. These patients are usually referred to US for further evaluation. MRI Fetal Without IV Contrast Fetal MRI without IV contrast is not useful as an initial imaging modality for the evaluation of known or suspected multiple gestations. There is no relevant literature regarding the use of fetal MRI without IV contrast in these patients. Sometimes a gestational sac may be identified incidentally during imaging for other reasons. These patients are usually referred to US for further evaluation. US Assessment for TTTS Complications affecting MC twins such as TTTS and other conditions related to a single shared placenta usually develop after 14 weeks and do not occur in the first trimester [9]. Hence, US assessment for TTTS is not useful in the first trimester [9]. However, embryonic crown-rump length (CRL) measurements are performed during Multiple Gestations transabdominal and transvaginal imaging of the pregnant uterus.
Multiple Gestations. Multiple gestation pregnancies are most often detected in the first trimester. Sometimes a point-of-care US may have been performed. At the time of this evaluation, the most important assessments include ascertaining the location of the pregnancy, identifying the number of gestational sacs, and determining the chorionicity and amnionicity [24]. An NT sonogram performed between 11 and 14 weeks has been incorporated into many practices. If not previously imagined, multiple gestations can sometimes be detected on that examination. MRI Fetal Without and With IV Contrast Fetal MRI without and with intravenous (IV) contrast is not useful as an initial imaging modality for the evaluation of known or suspected multiple gestations. Gadolinium contrast administration is avoided during pregnancy and is used only in exceptional circumstances. There is no relevant literature regarding the use of fetal MRI without and with IV contrast in these patients. Sometimes a gestational sac may be identified incidentally during imaging for other reasons. These patients are usually referred to US for further evaluation. MRI Fetal Without IV Contrast Fetal MRI without IV contrast is not useful as an initial imaging modality for the evaluation of known or suspected multiple gestations. There is no relevant literature regarding the use of fetal MRI without IV contrast in these patients. Sometimes a gestational sac may be identified incidentally during imaging for other reasons. These patients are usually referred to US for further evaluation. US Assessment for TTTS Complications affecting MC twins such as TTTS and other conditions related to a single shared placenta usually develop after 14 weeks and do not occur in the first trimester [9]. Hence, US assessment for TTTS is not useful in the first trimester [9]. However, embryonic crown-rump length (CRL) measurements are performed during Multiple Gestations transabdominal and transvaginal imaging of the pregnant uterus.