2) AVMs

The subtypes below (1-4) are based on the Anson and Spetzler Classification from their 1992 article

http://emedicine.medscape.com/article/248456-overview

see also

http://www.medschool.lsuhsc.edu/neurosurgery/nervecenter/spavm.html

1 dural AVF

2 glomus: discreet intramedullary AVM

3 juvenile: Intramedullary with extramedullary component (Cobb syndrome/metameric)  

4 pial AVF (intradural extramedullary)

This appears to be the basis of the Core Exam Categories below

Of course real life includes other vascular lesions:

Epidural fistula in the lumbar region

In 2002 Spetzler modified this classification. One of the controversial aspects of this revision is that they added cavernomas and hemangioblasotomas as neoplasms.

Reference:

Historical Review

Neuroradiology greatly advanced the understanding of the various vascular pathologies.

http://www.medscape.com/viewarticle/554871_4

Fascinoma Case Report

46 yo woman with myelopathy aggravated by menstruation

http://thejns.org/doi/full/10.3171/jns.1991.75.6.0947?prevSearch=berenstein%2Bkim%2Bchoi&searchHistoryKey=