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Radionuclide studies in an unusual case of Dandy-Walker cyst.

A case of Dandy-Walker cyst is described in which radionuclides but not air penetrated the cyst and lateral ventricles from a lumbar injection. This case demonstrates the difficulty in differentiating posterior fossa cysts by roentgen techniques. Further studies are needed to determine the role of cisternography in evaluating these cysts.