“Keyboard sign” and “coffee bean sign” in the prenatal diagnosis of ileal atresia: A case report

Figure 1 Ultrasound findings. Two rows of intestines arranged in an “S” shape in parallel in the middle abdomen of the fetus (arrows).

Figure 2 Subsequent ultrasound findings. After 30 minutes, only a row of intestinal canal was seen horizontally arranged in the middle abdomen (arrow).

Figure 3 Keyboard sign. The proximal “keyboard sign” was dense and neat (left arrow), while the distal “keyboard sign” was sparse and irregular (right arrow).

Figure 4 Coffee bean sign. The internal low echo of the “coffee bean sign” was mesentery with a blood flow signal (arrow).

Figure 5 Autopsy findings. A: Dilated jejunum, small colon; B: Ileal atresia, the proximal blind end (left arrow). The distal blind end, with the “coffee bean sign” (right arrow).