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The normal sequence of formation of the components of the corpus callosum has a bear-ing on anomalous development and impacts on the examination of anomalies by magnetic res-onance (MR) imaging. Knowledge of the normal developmental sequence permits distinguishing developmental from destructive lesions of the corpus callosum. Correct analysis of anomalies of the corpus callosum depends on precise identification of its components. Before the era of computed tomography (CT), the compo-nents of the corpus callosum were not identified readily. With cross-sectional imaging, the cal-losal components became visible. With this came interest on the part of neuroradiologists i