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Atrophy of the caudate nucleus and putamen with concomitant enlargement of the frontal horns of the lateral ventricles.
The inter caudate distance is 2.13, the frontal horn width is 3.4,and the inner table width is 10.96. Thus, the frontal horn width to intercaudate ratio (FH:CC) is low 1.6 (normal = 2.2-2.6) and the intercaudate distance to inner table ratio (CC:IT) is increased 0.19 (normal = 0.09-0.12)
All the above calculations and the clinical history are consistent with Huntington disease.