Klein et al listed a number of criteria for making the diagnosis of the Dandy-Walker malformation in a fetus based on MRI images. The authors are from Hopital Necker Enfants-Malades in Paris.
Criteria for the diagnosis of the Dandy-Walker malformation - all of the following:
(1) There is an enlargement of the posterior fossa.
(2) A large median cyst is present in the posterior fossa that has a wide/broad communication with the fourth ventricle.
(3) The cerebellar vermis is small, rotated and raised.
(4) The cerebellar hemispheres are displaced antero-laterally but otherwise are normal.
(5) The tentorium shows an upward displacement.
(6) The brainstem is normal.
If any of these features are missing then the malformation was not diagnosed as the Dandy-Walker malformation.
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