Fig. 12.

Inaccurate prenatal and postnatal tractography of the corticospinal tracts. a, b Case 4. a Prenatal (30+5 gestational weeks) and (b) postnatal (7 months) tractography pair of the corticospinal tracts are illustrated (yellow, right; green, left). Note the disrupted appearance of the fibers (arrowheads in a) at the proximal and distal aspects of the right corticospinal tract. This was thought to be a result of poor signal-to-noise ratio on the MRI. By contrast, the postnatal corticospinal tracts appear intact. This prenatal case was categorized as not being accurate for the right corticospinal tract because of the disrupted morphology