The term “Phrygian cap” describes a gallbladder with one wall shorter than the other such that the fundus folds over the body. It is also described as a transverse congenital septum in the fundus of the gallbladder. This congenital gallbladder deformity is of no clinical importance.
During pregnancy, transverse sections of the abdomen performed for abdominal circumference measurement or for fetal anomalies screening, may occasionally reveal this gallbladder shape variant.
Here are some images and videos of Phrygian cap gallbladder deformity obtained in second and third trimester:
Images 1, 2, 3, and 4: Images show a few examples of Phrygian cap deformity of the gallbladder obtained during second and third trimester scans (arrows point at the gallbladder in the place where the gallbladder folds and creates a pseudo-septum).
Image 5: The drawing shows a shape of so called "Phrygian cap". The Phrygian cap is a soft conical cap with the top pulled forward, associated in antiquity with the inhabitants of Phrygia, a region of central Anatolia (source: Wikipedia) and popularized by the cartoon character Smurf
Videos 1, 2: Videos show two examples of Phrygian cap deformity of the gallbladder obtained during second and third trimester scans.