Cranial Nerve Disorder

This phase I/II trial studies the side effect and best dose of steroid therapy (prednisone or methylprednisolone) in improving symptoms of late radiation-associated lower cranial neuropathy in oropharyngeal cancer survivors. Steroid therapy with prednisone or methylprednisolone may help to improve symptoms associated with late radiation-associated lower cranial neuropathy.

This phase II trial studies how well gadolinium and ferumoxytol magnetic resonance imaging (MRI) work in diagnosing patients with abnormalities in the central nervous system. Diagnostic procedures, such as gadolinium and ferumoxytol MRI, may help find and diagnose abnormalities in the central nervous system.

The goal of this study is to find out whether cranial nerves are affected in people with Behçet's Disease (BD), and how this might relate to other disease features. Cranial nerves control important functions such as vision, facial movement, hearing, swallowing, and balance. The main questions this study will address are: * Do people with BD have changes in cranial nerve function compared to healthy individuals? * Are these changes linked to disease duration, symptoms, or lab results? Participants will: * Answer questions about their medical history and BD symptoms * Complete questionnaires on daily function, mood, and autonomic symptoms * Have a clinical examination of all 12 cranial nerves * Undergo non-invasive electrical tests to assess nerve function This study will not involve any medications. All procedures will be completed in one visit.