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In page Hemiparesis:

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In a few cases, lesions above the medulla have resulted in ipsilateral hemiparesis:

  • In several reported cases, patients with hemiparesis from an old contralateral brain injury subsequently experienced worsening of their hemiparesis when hit with a second stroke in the ipsilateral brain.[1][2][3] The authors hypothesize that brain reorganization after the initial injury led to more reliance on uncrossed motor pathways, and when these compensatory pathways were damaged by a second stroke, motor function worsened further.[citation needed]
  • A case report describes a patient with a congenitally uncrossed pyramidal tract, who developed right-sided hemiparesis after a hemorrhage in the right brain.[4]