Fetal MRI: Vertebral Level vs. Kidney Border for Predicting Low Conus Yield Similar Accuracy

Vertebral level vs. kidney border for predicting postnatal low conus on fetal MRI: no significant accuracy difference (p=0.66). Postnatal confirmation in 65% of 34 imaged fetuses.

• Among 34 fetuses with postnatal imaging, 65% had confirmed low conus (L3 or below); 41% of those confirmed underwent detethering surgery.
• Interpretation may be influenced by gestational age, transitional lumbosacral anatomy, and occult tethering lesions; only 15% of the cohort had postnatal imaging.

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