{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,6]],"date-time":"2026-06-06T02:12:01Z","timestamp":1780711921275,"version":"3.54.1"},"reference-count":30,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2012,2,27]],"date-time":"2012-02-27T00:00:00Z","timestamp":1330300800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Ultrasound in Obstet &amp; Gyne"],"published-print":{"date-parts":[[2012,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>In view of the implementation of magnetic resonance imaging (MRI) as an adjunct to ultrasonography in prenatal diagnosis, this study sought to demonstrate normal penile growth on prenatal MRI.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>This was a retrospective study of MRI of 194 male fetuses (18\u201334 weeks' gestation) with normal anatomy or minor abnormalities. On sagittal T2\u2010weighted MRI sequences, we measured penile length from the glans tip to the scrotal edge (outer length) and from the glans tip to the symphyseal border (total length). Descriptive statistics, as well as correlation and regression analysis, were used to evaluate penile length in relation to gestation. T\u2010tests were calculated to compare mean outer\/total length on MRI with published ultrasound data.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Mean length values, including 95% CIs and percentiles, were defined. Penile length as a function of gestational age was expressed by the following regression equations: outer mean length = \u2212 5.514 + 0.622 \u00d7 gestational age in weeks; total mean length = \u2212 8.865 + 1.312\u00d7 gestational age in weeks. The correlation coefficients, <jats:italic>r<\/jats:italic> = 0.532 and <jats:italic>r<\/jats:italic> = 0.751, respectively, were statistically significant (<jats:italic>P<\/jats:italic> &lt; 0.001). Comparison of outer penile length on MRI with published ultrasound penile length data showed no significant differences, while total penile length on MRI was significantly greater than ultrasound penile length (<jats:italic>P<\/jats:italic> &lt; 0.001).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Our MRI results provide a reference range of fetal penile length, which, in addition to ultrasonography, may be helpful in the identification of genital anomalies. Outer penile length on MRI is equivalent to penile length measured on ultrasound, whereas total length is significantly greater. Copyright \u00a9 2012 ISUOG. 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