====== 1949 ======

[[1948]]-[[1950]]

In 1949, [[Henk Verbiest]] first proposed the concept of [[stenosis]] in [[spinal canal]], [[lumbar intervertebral foramen]]; that is, lumbar [[spinal stenosis]] (LSS)
((Verbiest H. Primary stenosis of the lumbar spinal canal in adults, a new syndrome. Ned Tijdschr Geneeskd. 1950;94:2415–2433.))
((VERBIEST H. A radicular syndrome from developmental narrowing of the lumbar
vertebral canal. J Bone Joint Surg Br. 1954 May;36-B(2):230-7. PubMed PMID:
13163105.
)).
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[[Jean Talairach]], a psychiatrist who eventually trained as a neurosurgeon, was the first to describe [[anterior capsulotomy]] in [[1949]].
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In [[1949]], [[Lars Leksell]] developed his Arc Centered [[Stereotactic Frame]] based on Polar coordinate system. 
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At the first post-war International Congress of Neurology in [[Paris]], [[1949]], Alfonso Asenjo, from [[Chile]], arranged for a meeting with a group of neurosurgeons in order to discuss how neurosurgery might present itself at international congresses in the future. In the end of a deliberate discussion it was decided to participate as a separate group.
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The treatment of [[colloid cyst]]s has evolved rapidly since the first successful excision of a colloid cyst via the [[transcortical transventricular approach]] by Walter Dandy in [[1921]]
((Dandy WE. Benign tumors of the third ventricle. In: Thomas CC, editor. Diagnosis and Treatment. Springfield, Baltimore, IL: 1933.)).
This was followed closely by a [[transcallosal approach]] by Greenwood in [[1949]]
((Greenwood J., Jr Paraphysial cysts of the third ventricle; with report of eight cases. J Neurosurg. 1949;6:153–9.)).