<prompt> According to Spetzler Martin Grading System for AV malformations, the score of a AV malformation of size 3-6 mm with deep venous drainage and location near internal capsule is2345  <response>: Ans. d 5Ref: Sabiston 20th Edition Page 1904 Spetzler - Martin Grading System is used for AVM grading in Brain. This grading helps in management also. Grade varies from 1-5 based on the following points: Size, Location and Deep venous drainage. Lower score has good outcome. Grade 1 AVM would be considered as small, superficial, and located in non-eloquent brain, and low risk for surgery. Grade 4 or 5 AVM are large, deep, and adjacent to eloquent brain.Spetzler - Martin Grading System: for AVM brain Characteristic of lesionNumber of pointsSizeSmall diameter 3cm1 Medium diameter 3-6cm2 Large diameter 6cm3EloquenceNo eloquent siteEloquent site sensorimoter, language, or thalamus; internal capsule; brain stem; cerebellar peduncles, or cerebellar nuclei01Pattern of venous drainageSuperficial only0Any deep1 