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Register for OBGYN.net Ultrasound: Case of the Month
January, 1998 - Case of the Month
Terry J. DuBose, M.S., RDMS, RT(R), FAIUM
Director, Diagnostic Medical Sonography Program, and
OBGYN.net Ultrasound Advisory Panel Chairman
In February 1988, the patient, a 26-year-old married woman, experienced moderate vaginal bleeding. She contacted her gynecologist, who referred her to an ultrasound clinic for a sonographic workup.
History established that the patient’s last menstrual period (LMP) was 7.4 weeks earlier. Although she had missed one period, she did not know whether she was pregnant at the time.
Real-time sonography (Scans A and B) revealed chorionic sac with an embryonic heart beat of 151 beats per minute. Blood was identified around the sac.
A. Transabdominal, saggital sections of the uterus (two planes of view)
Scan B: Transverse section of the uterus.
Data analysis (using the Basic Baby IIä program) indicated embryonic heart rate (EHR) to be 150.9 beats per minute, corresponding to a fetal age of 7.3 weeks. (Scan C). Crown-rump length was 10.8 mm, suggesting a fetal age of 7.2 weeks.
Scan C: Sagittal M-mode tracing measured from the embryo at the center of the chorionic sac. Note: the body marker incorrectly indicates transverse.
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