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Coronal section showing a focus of softening or necrosis in the inner portion (internal segment) of the globus pallidus in a case of carbon monoxide poisoning

The external segment of the pallidum is intact, as are the putamen and caudate nucleus. The inner capsule limits the focus medially. (Source: Case 1 of: Richter H. Beiträge zur Klinik und pathologischen Anatomie der extrapyramidalen Bewegungsstörungen [Contributions to the clinical and pathological anatomy of extrapyramidal movement disorders.]. Archiv für Psychiatrie und Nervenkrankheiten 1923;67:226-94.)

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