====== 1987 ======

[[1986]]-[[1988]]

The first [[Gamma Knife]] in the [[US]] in [[1987]].
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[[Deep brain stimulation]] (DBS) is a [[neurosurgical [[procedure]]]] introduced in [[1987]], involving the implantation of a medical device called a [[neurostimulator]] (sometimes referred to as a 'brain pacemaker'), which sends electrical impulses, through implanted electrodes.
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In [[1987]] [[Yaşargil]] defined cerebral micro[[arteriovenous malformation]]s as a subgroup of [[pial arteriovenous malformation]] characterizad by a [[nidus]] of 1 cm or smaller
((Yaşargil MG: Microneurosurgery. Volume IIIA. AVM of  the  Brain,  History,  Embryology,  Pathological  Considerations, Hemodynamics, Diagnostic Studies, Microsurgical  Anatomy. New York: Thieme, 1987)).
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Although Griffith and Veerapen reported a case of [[endonasal]] approach to the [[sellar region]] in [[1987]], the [[transsphenoidal]] endonasal approach did not gain popularity.
((Griffith HB, Veerapen R. A direct transnasal approach to the sphenoid sinus.
Technical note. J Neurosurg. 1987 Jan;66(1):140-2. PubMed PMID: 3783248.))
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[[Atypical teratoid rhabdoid tumor]] was originally described a histological variant of [[Wilm’s tumor]] in [[1978]].

Primary intracranial diseases were initially reported in [[1987]] and subsequently, defined as a distinct CNS neoplasm in [[1996]] and added to the World Health Organization (WHO) Brain Tumor Classification in [[2000]] (grade IV).
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[[Torg-Pavlov ratio]], (AKA Pavlov ratio, Torg ratio) or so called “Canal Body Ratio” CBR was first described in [[1987]] by Pavlov et al., it represented the ratio between the sagittal diameter of the spinal canal and the sagittal diameter of the corresponding vertebral body and was first measured on lateral cervical spine X-ray. A ratio of <0.7–0.8 indicated a significant spinal stenosis with high risk of neurological injury
((Pavlov H, Torg JS, Robie B, et al. Cervical Spinal
Stenosis: Determination with Vertebral Body Ratio
Method. Radiology. 1987; 164:771–775))
((Torg JS, Naranja RJ, Pavlov H, et al. The Relationship
of Developmental Narrowing of the Cervical Spinal
Canal to Reversible and Irreversible Injury of the
Cervical Spinal Cord in Football Players. J Bone Joint
Surg. 1996; 78A:1308–1314)):
the ratio of the AP diameter of the spinal canal at the mid VB level to the VB at the same location. A ratio < 0.8 is sensitive