Abstract
As a result of the widespread availability and utilization of MRI, Chiari malformations (CM) presently are discovered much more frequently. Their variety of clinical manifestations and imaging findings can be perplexing. This CME activity will provide the diagnostic radiologist with an in-depth discussion of various CM and their common MRI findings, with additional important information provided by advanced imaging developments such as fetal MRI and cerebrospinal fluid flow studies. The pathophysiologic feature in all CM is the crowding of the foramen magnum by hindbrain herniations.1,2 Since first described by the Viennese pathologists Chiari (in 1891) and Arnold (in 1894), CM have become one of the most commonly encountered neurosurgical and neuroradiologic dilemmas.3,4 The most common clinically encountered forms of CM are Chiari I and II, although rarer forms do exist.
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