The four parent pelvic types of the Caldwell-Moloy classification. A line passing through the widest transverse diameter divides the inlets into posterior (P) and anterior (A) segments.
Alobar holoprosencephaly. A. Transverse cranial image of a 26-week fetus with alobar holoprosencephaly, depicting fused thalami (Th) encircled by a monoventricle (V). The midline falx is absent. B. In this profile view of the face and head, a soft tissue mass—a proboscis (arrow), protrudes from the region of the forehead.
Sacrococcygeal teratoma. Sonographically, this tumor appears as a solid and/or cystic mass that arises from the anterior sacrum and tends to extend inferiorly and externally as it grows. In this image, a 7 × 6 cm inhomogeneous solid mass is visible below the normal-appearing sacrum. There is also an internal component to the tumor.
Fetal profile. A. This image depicts a normal fetal profile. B. This fetus has severe micrognathia, which creates a severely recessed chin.
Cystic hygromas. A. This 9-week fetus with a cystic hygroma (arrow) was later found to have Noonan syndrome. B. Massive multiseptated hygromas (arrowheads) in the setting of hydrops fetalis at 15 weeks.
Congenital diaphragmatic hernia. In this transverse view of the thorax, the heart is shifted to the far right side of the chest by a left-sided diaphragmatic hernia containing stomach (S), liver (L), and bowel (B).
Transverse (A) and sagittal (B) images of a 26-week fetus with a very large left-sided microcystic congenital cystic adenomatoid malformation (CCAM). The mass (C) fills the thorax and has shifted the heart to the far right side of the chest, with development of ascites (asterisks). Fortunately, the mass did not continue to grow, the ascites resolved, and the infant was delivered at term and did well following resection.
Congenital high airway obstruction sequence (CHAOS). The lungs appear brightly echogenic, and one is marked by an “L.” The bronchi, one of which is noted by an arrow, are dilated with fluid. Flattening and eversion of the diaphragm is common, as is ascites (asterisks).
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