Caudate–right lobe ratio
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Caudate-right lobe ratio (C/RL) is used in the assessment of livers, usually in the setting of cirrhosis, in which there is atrophy of the right lobe with hypertrophy of the caudate lobe.
Method for measuring
- image: axial slice immediately below the bifurcation of the main portal vein
- line 1: a parasagittal line drawn through the right lateral border of the portal vein
- line 2: a parasagittal line drawn through the left lateral border of the caudate lobe
- line 3: line orthogonal to lines 1 and 2 midway between the portal vein and the IVC extended to the right liver edge
- RL measurement: along line 3, from right liver edge to line 1
- C measurement: along line 3, between line 1 and line 2
- caudate-right lobe ratio: C/RL
Interpretation
- C/RL <0.6 = normal (does not exclude cirrhosis)
- C/RL 0.6-0.65 = borderline
- C/RL >0.65 = 96% likely to be cirrhotic
- C/RL >0.73 = 99% likely to be cirrhotic
Modified measurement
An alternative placement of line 1 has been proposed by HitomiAwaya et al. as being more sensitive and specific 2. Rather than line 1 intersecting the right lateral border of the main portal vein, they describe drawing line 1 through the right lateral aspect of the right portal vein bifurcation.
-</ul><h4>Modified measurement</h4><p>An alternative placement of line 1 has been proposed by Hitomi et al. as being more sensitive and specific <sup>2</sup>. Rather than line 1 intersecting the right lateral border of the main portal vein, they describe drawing line 1 through the right lateral aspect of the right portal vein bifurcation.</p>- +</ul><h4>Modified measurement</h4><p>An alternative placement of line 1 has been proposed by Awaya et al. as being more sensitive and specific <sup>2</sup>. Rather than line 1 intersecting the right lateral border of the main portal vein, they describe drawing line 1 through the right lateral aspect of the right portal vein bifurcation.</p>
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