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Radiology, Vol 194, 713-715, Copyright © 1995 by Radiological Society of North America

ARTICLES

Fetal cerebral ventricular atrium: difference in size according to sex

MD Patel, RB Goldstein, S Tung and RA Filly
Department of Radiology, San Francisco General Hospital, University of California 94143.

PURPOSE: To determine whether the diameter of the fetal lateral ventricular atrium is larger in male than in female fetuses. MATERIALS AND METHODS: The atrial diameter in 219 fetuses retrospectively identified from a consecutive group of healthy newborns was measured without knowledge of the subject's sex. RESULTS: Atrial size demonstrated a near-normal distribution, with mean size for all subjects 6.1 mm +/- 1.3 (standard deviation). When separated by sex, the mean atrial diameter of 122 female fetuses was 5.8 mm +/- 1.3, and the mean atrial diameter of 97 male fetuses was 6.4 mm +/- 1.3. The difference in mean size is statistically significant (P < .005). CONCLUSION: Male fetuses have a slightly larger atrial size than female fetuses. This discovery has implications for defining the upper limit of normal for fetal ventricular atrial size.


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