25 August 2023
: Case report
Unmasking the Hidden Fetus: Introducing the Circled Delta Sign and Reversed Circled Delta Sign for Accurate Identification on Abdominal Radiography
Mistake in diagnosis
Hsing-Hao Ho
DOI: 10.12659/AJCR.940689
Am J Case Rep 2023; 24:e940689
Figure 3. (A) The circled delta sign indicates a fetus with a vertex presentation on an abdominal radiograph. The outer circle represents the contour or mass effect of an enlarged uterus, whereas the circle and the curve of the inner delta represent the fetus’s skull and spine, respectively. (B) The reversed circled delta sign indicates a fetus with a breech presentation on an abdominal radiograph.