Erratum.

<body><sec id="s1"><title /><p>In the article by Rodríguez et al. entitled "Fetal Advanced Neurosonography in the First Trimester of Pregnancy" [Fetal Diagn Ther. 2025; DOI: 10.1159/000546460], there is an error in the legends for Figures 4 and 7.</p><p>The final corrections were not implemented prior to publication. These corrections were intended to clarify the meaning of the red arrows appearing in Figures 4 and 7. Although the author had requested these clarifications be added to the figure legends, they were omitted in the final version.</p><p>The missing legend details are as follows:</p><p><bold>Fig. 4.</bold> Advanced exploration. <bold>a</bold> Transcerebellar axial. <bold>b</bold> Posterior fossa axial. a: Transcerebellar (oblique axial): 1+...+: transcerebellar diameter (TCD) cerebellar hemispheres (C). b: Posterior fossa (parallel and inferior to a): (Red arrow) Choroid plexus of the IV ventricle (PC). 1+...+ IV ventricle (IVV) space between the brain stem and PC, in to in. 2+...+ cisterna magna (CM) (from PC to internal border of occipital bone), in to in.</p><p><bold>Fig. 7.</bold> Advanced exploration, sagittal section. IV ventricle or intracranial translucency (IT). IT measurement: from the posterior border of the brain stem to the choroid plexus of the IV (PC) (Red arrow).</p><p>The original article has been updated.</p></sec></body>.