Early imaging is key to the diagnosis of the many anomalies that are unique to multifetal gestations. The third slideshow of our ultrasound collection includes examples of these anomalies.
Early imaging is key to the diagnosis of the many anomalies that are unique to multifetal gestations. The third slideshow of our ultrasound collection includes examples of these anomalies.Â For more information on first-trimester anomalies and second-trimester anomalies discussed anomalies of the head and brain, check outÂ Part 1Â of the series. For information on second-trimester anomalies of the body and limbs that shouldn't be missed, check out Part 2.More information on ultrasound diagnoses can be found in, 'Using ultrasound to recognize fetal anomalies.'
Thick membrane in all 3 intertwin membranes at their juncture in the center of the uterine cavity (ipsilon sign) confirms the first-trimester trichorionic triplets
Polyhydramnios in the recipient twin's sac in a case of twin-to-twin transfusion syndrome, second trimester
The recipient fetus, left, moving freely throughout the uterine cavity. The donor fetus, right, remains in the same position.
Intertwin membrane, often seen only when scanning close to the donor twin near flexed joints - neck, axillae, and hips.
Second trimester monoamniotic twins, umbilical cord entanglement visible on color Doppler examination
First-trimester conjoined twins. Sagittal view shows 2 cephalic poles, right. Note that the upper cephalic pole could be misinterpreted as a large omphalocele of a single fetus.
Early second-trimester twin reversed arterial perfusion sequence showing the amorphous acardiac fetal mass