Lipoma of the corpus callosum and mirror writingMirror writing and reading are rare conditions without definitive mechanisms.1 A 19-year-old left-handed man had a lifetime history of reading disabilities and mirror writing (figure A). The examination results were unremarkable, with fluent, nonstuttering speech. Brain imaging revealed partial agenesis of the corpus callosum (CC) with a lipoma (figures B and C). Many conditions may present with mirror writing or reading 1,2 ; association with a lipoma and CC agenesis supports the concept that CC abnormalities may be causative. 2 We cannot, however, eliminate causal involvement of the supplementary motor area.
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