Which of the following could indicate a nontraumatic brain injury?

Hemiplegia or hemiparesis can indeed indicate a nontraumatic brain injury as these conditions are associated with neurological deficits that often result from issues such as strokes or brain tumors. In a nontraumatic context, hemiplegia (complete paralysis on one side of the body) or hemiparesis (weakness on one side) suggests that there is an issue within the brain affecting the motor pathways, which can occur due to various intrinsic factors like ischemic events or other pathologies rather than an injury caused by an external force.

In contrast, while dilated pupils can be a sign of increased intracranial pressure or other brain issues, they are not exclusively indicative of nontraumatic injuries. Urinary retention and constipation are signs of autonomic dysregulation but are less specific to the presence of brain injury. Additionally, eyes turning toward the paralyzed side can occur with specific neurological conditions but do not directly denote a nontraumatic brain injury by themselves. Therefore, hemiplegia or hemiparesis serves as a clear indicator of potential underlying brain issues consistent with nontraumatic causes.