The Spetzler-Martin grade used to estimate operative risk of an arteriovenous malformation assigns points based on several features of the lesion. Which factor is NOT part of this grading system?
- A Maximum diameter of the nidus
- B Pattern of venous drainage, superficial or deep
- C Patient age at presentation ✓
- D Eloquence of adjacent brain
Correct answer: C. Patient age at presentation
Explanation
The Spetzler-Martin classification scores three variables: nidus size (less than 3, 3 to 6, more than 6 cm), deep versus superficial venous drainage, and location in eloquent cortex such as sensorimotor, language, or visual areas. Grades I to II favour surgical resection, grade III is individualised, and grades IV to V generally warrant conservative management. Age is not scored, although younger patients may be offered surgery because cumulative lifetime haemorrhage risk rises over decades.
Reference: Greenberg's Handbook of Neurosurgery, 10th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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