Supplementary Material for: Mirror Artifacts in Obstetric Ultrasound: Case Presentation of a Ghost Twin during the Second-Trimester Ultrasound Scan
Ahn H.
Hernández-Andrade E.
Romero R.
Ptwardhan M.
Goncalves L.F.
Aurioles-Garibay A.
Garcia M.
Hassan S.S.
Yeo L.
10.6084/m9.figshare.5477902.v1
https://karger.figshare.com/articles/dataset/Supplementary_Material_for_Mirror_Artifacts_in_Obstetric_Ultrasound_Case_Presentation_of_a_Ghost_Twin_during_the_Second-Trimester_Ultrasound_Scan/5477902
<p>Mirror artifacts are produced by the reflection of ultrasound waves
after they propagate through a structure and encounter a strong and
smooth interface capable of acting as a mirror. Ultrasound waves bounce
back and forth between the mirroring interface and the reflective object
and then eventually return to the transducer. The typical display of
the mirror artifact consists of two similar structures separated and at
similar distances from the reflective interface. We report a mirror
artifact in a patient with a singleton gestation at 18 weeks. The image
was interpreted as consistent with a twin gestation using transabdominal
and transvaginal ultrasound. The differential diagnosis consisted of an
abdominal heterotopic pregnancy. The presence of synchronized but
opposite movements of both fetuses, and the blurred image of the second
fetus, suggested a mirror artifact. The reflective surface was created
by the interface located between a distended rectosigmoid filled with
gas and the posterior uterine wall. Mirror artifacts can lead to
diagnostic errors. This case illustrates how a distended rectosigmoid
colon can generate an image that simulates either a twin gestation or an
abdominal heterotopic pregnancy.</p>
2017-10-06 11:15:54
Ultrasound physics
Twin gestation
Abdominal heterotopic pregnancy
Diagnostic error