Intracerebral Hemorrhage Volume (ABC/2)
ABC/2 (Kothari et al., 1996)Estimates parenchymal hematoma volume on CT with the ABC/2 method (ellipsoid hematomas) or ABC/3 variant (irregular, separated, or multinodular hematomas).
Also searched as: ICH · CT · stroke · hematoma · brain bleed
Information
Incomplete input
- Enter A and B (the two largest perpendicular diameters, in mm).
How this tool works
The ABC/2 method of Kothari and colleagues approximates a hematoma as an ellipsoid. A is the greatest hemorrhage diameter on the axial slice with the largest hematoma area, B is the greatest diameter perpendicular to A on that slice, and C is the craniocaudal extent (directly measured, or approximated as the number of involved slices times the slice thickness). Volume in milliliters equals A x B x C (in mm) divided by 2 and by 1000. For markedly irregular, separated, or multinodular hematomas, dividing by 3 (ABC/3) tracks planimetric volume more closely. Hematoma volume is a powerful prognostic variable: 30 mL is the cutoff used in the ICH score, and very large volumes with a low Glasgow Coma Scale score portend poor outcome.
References
- Kothari RU, et al. The ABCs of measuring intracerebral hemorrhage volumes. Stroke. 1996;27:1304-1305
- Hemphill JC 3rd, et al. The ICH score: a simple, reliable grading scale for intracerebral hemorrhage. Stroke. 2001;32:891-897
- Radiopaedia: ABC/2 rule for intracerebral hemorrhage volume
Implemented from the cited published sources. Educational use only; confirm against current guidelines before clinical use.
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