FIG 11. Molar tooth malformation in a 16-month-old patient with Joubert syndrome.

A, Sagittal spin-echo (550/11) image shows a small, dysplastic cerebellar vermis. The folial pattern is abnormal. Note the narrow isthmus (junction of the mesencephalon and pons) (arrow).

B, Axial spin-echo (550/15) image shows the very small vermis (small arrow), the broad, horizontal superior cerebellar peduncles, and the narrow isthmus (large arrow).

C, Coronal spin-echo (600/11) image shows a midline cleft separating the two dysplastic areas of vermis (arrows).