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Sonographic Definition of the Fetal Situs

Bronshtein, Moshe MD; Gover, Ayala; Zimmer, Etan Z. MD

Current Commentary

The sonographic definition of the fetal situs is of diagnostic importance. However, the current methods that rely on the position of both heart and stomach are not always reliable. Presented are the right‐hand rule for transabdominal scanning and the left‐hand rule for transvaginal scanning which enable the definition of the fetal situs. The presented rules of thumb enable a definite diagnosis of the fetal situs in all cases and apply for all fetal positions and presentations.

Two simple rules of thumb enable a definite diagnosis of the fetal situs in both transabdominal and transvaginal ultrasonography.

Department of Obstetrics and Gynecology, Rambam Medical Center, Technion‐Israel Institute of Technology, Haifa, Israel

Address reprint requests to: Etan Z. Zimmer, MD, Department of Obstetrics and Gynecology, Rambam Medical Center, Haifa 31096 Israel; E‐mail: etan@tx.technion.ac.il.

Received November 8, 2001. Received in revised form February 13, 2002. Accepted February 28, 2002.

© 2002 The American College of Obstetricians and Gynecologists