Fig 4.

MR imaging of a 6-day-old term neonate initially diagnosed as having choanal atresia, vertebral anomalies, and coactation of aorta. A, Sagittal FSPGR image shows an area of fusion in the subcallosal region (arrowheads). B, Axial T2-weighted image shows the abnormal fusion in the same region (arrowheads). An azygous ACA is present in the anterior IHF. C, Axial T2-weighted image slightly superior shows thickened fornices (arrow) and partial fusion of the thalami. D, Coronal FSPGR image shows thickened fornices (arrowheads) and an area of fusion in the preoptic area (arrow).