Clinical Reasoning: A 48-year-old Woman With 6 Months of Vivid Visual Hallucinations.

Visual hallucinations are frequently encountered in clinical practice. It is critical for neurologists, particularly those in training, to develop a systematic approach for evaluating patients presenting with such unique and often perplexing symptoms. Here, we present the case of a 48-year-old woman who developed vivid visual hallucinations after receiving nivolumab for melanoma. We discuss the broad differential diagnosis for visual hallucinations and how the history and examination can guide one's evaluation.