Fig 2.

T2-weighted MR image of a 2-day-old patient with OFD VI. A, Midsagittal T2-weighted MR image shows a significant vermian hypoplasia-dysplasia of the vermis (long black arrow), an enlarged fourth ventricle (white asterisk), a PF with marked retrocerebellar CSF collection (black asterisk), and an HH (white arrows). In addition, the mesencephalon is elongated (long white arrow), the size of the pons is reduced (short black arrow), the CC is thin, and the interthalamic adhesion is enlarged (short white arrow). B, Axial T2-weighted MR image demonstrates hypoplasia of the vermis and both cerebellar hemispheres (black arrows), the characteristic MTS with thickened and elongated superior cerebellar peduncles, an abnormally deepened IF, an enlarged PF with marked retrocerebellar CSF collection (black asterisk), and an HH (white arrows). Modified with Permission from Poretti et al.¹⁵