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Lumbar spina bifida (2)

(Source: Zappert J. Organic diseases of the nervous system. Translated by R. Max Goepp. In: Pfaundler M, Schlossmann, editors. The Diseases of Children: A Work for the Practising Physician. Volume 4. Philadelphia and London: J.B. Lippincott Company, 1908:123-284. Public domain.)