Objective: To review the value of ultrasonographic evaluation on fetal limbs anatomy and malformations in prenatal diagnosis using a systematic continuous sequence approach (SCSA).
Methods: Successive 4,932 prenatal ultrasonographic evaluation during gestation aging 14 - 40 weeks from August 2000 to September 2002 entered the present review. SCSA was applied to scan each limb of the fetus respectively.
Results: The anatomic structures of the four limbs of the fetus were clearly displayed and correctly recognized on ultrasonic images using the SCSA in 4 750 cases (96.3%). Ninety eight limb malformations of 34 fetuses were correctly diagnosed (87.2%). Whereas 16 malformations of 5 fetuses were missed to recognize (12.8%). The diagnoses were confirmed after subsequent labor or induced labor. The sensitivity, specificity, accuracy, positive and negative predictive values were 87.2%, 99.8%, 99.2%, 81.0% and 99.9%, respectively.
Conclusion: The majority of fetal limb structures and malformations can be clearly demonstrated on prenatal ultrasonic imaging using SCSA. SCSA for prenatal ultrasonographic evaluation of the fetal limbs is a reliable and accurate diagnostic modality so far as the skills become more sophisticated.
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