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Table 1 Grading system for catheter tip location[21] with additional grades 1a/1b

From: Guided (VENTRI-GUIDE) versus freehand ventriculostomy: study protocol for a randomized controlled trial

Grade Accuracy of placement Location of catheter tip
1 Optimal/adequate Ipsilateral frontal horn, including tip of third ventricle: 1a, no contact with ventricle wall; 1b, contact with ventricle wall
2 Suboptimal in non-eloquent tissue Contralateral frontal horn or lateral ventricle/corpus callosum/interhemispheric fissure
3 Suboptimal in eloquent tissue Brainstem/cerebellum/internal capsule/basal ganglia/thalamus/occipital cortex/basal cisterns