Frontal horn, intercaudate and inner table ratios (diagram)

Case contributed by A.Prof Frank Gaillard

Diagram demonstrating how to measure:

  • frontal horn width 
  • intercaudate distance
  • inner table width

FH/CC ratio: normal mean 2.2 to 2.6 (this ratio decreases with aging as a result of enlargement of the frontal horns of the lateral ventricles). 

CC/IT ratio : normal mean 0.09 to 0.12

Adapted from: Ho VB, HS Chuang, MJ Rovira and B Koo. “Juvenile Huntington disease: CT and MR features.” AJNR Am J Neuroradiol 16, no. 7 (August 1, 1995): 1405-1412.

Case Discussion

Both of these ratios are useful in younger patients with suspected Huntington disease and become abnormal before the caudates appear abnormal to visual inspection alone. 

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Case information

rID: 10768
Published: 19th Sep 2010
Last edited: 13th Aug 2019
Inclusion in quiz mode: Excluded

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