I came across the term subcortical retraction and cannot understand its meaning. Does it mean "the withering of the subcortical areas" (shrinking of subcortical white matter)?

From Follow-up of folinic acid supplementation for patients with cerebral folate deficiency and Kearns-Sayre syndrome:

Case 2. Multi Vane T2-Weighted TSE (T2W-MV) disclosed hyperintensity in dorsal brain stem (A), globus pallidus atrophy (B), subcortical retraction and white matter hyperintensity (C).

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