Prenatal Diagnosis of Atretic Cephalocele

We present two cases highlighting novel prenatal ultrasound findings in atretic cephalocele (AC) using high‐resolution ultrasound and microvascular flow imaging. This report includes the first prenatal ultrasound demonstration of key diagnostic AC features: superior sagittal sinus fenestration, observed in the parietal case, and a fibrous dural stalk, identified in both parietal and occipital cases. Both fetuses presented with a small midline scalp lesion, internal echoes, and an underlying bony defect without brain tissue herniation. Additionally, an increased brainstem–tentorium angle was measured in both, suggesting its potential utility as a supportive diagnostic marker. We propose a refined two‐tiered diagnostic framework to improve the accuracy of prenatal AC diagnosis and distinguish AC from true encephaloceles, facilitating appropriate parental counseling.