Final answer:
Conjoined twins may display various ultrasound abnormalities such as shared organs, skeletal deformities, and disrupted organ development, which can be better visualized with advanced 3D ultrasound imaging.
Step-by-step explanation:
Common ultrasound abnormalities in conjoined twins include complex anatomical connections such as shared organs or tissues, skeletal deformities, and disruptions in normal organ development. These abnormalities can vary greatly depending on the point of attachment and the extent of the twins' fusion. Often, conjoined twins may have an increased risk for heart defects, neural tube defects, and gastrointestinal anomalies. Advanced imaging techniques like 3D ultrasounds can provide a clearer picture of these complex anatomical structures, aiding in perinatal management and surgical planning.