A Case of Visual Hallucination With Frontal Lobe Infarction in a Patient With Giant Cell Arteritis.

Giant cell arteritis (GCA) can produce a variety of visual symptoms. Among these, visual hallucinations are rare and are usually accompanied by visual loss. We encountered a 79-year-old female with GCA who presented with visual hallucinations without visual loss. Magnetic resonance imaging (MRI) of the head revealed a stroke in the right frontal lobe, probably caused by GCA, resulting in visual hallucinations. Visual hallucinations are not well recognized by clinicians as a presentation of GCA. However, as shown in the present case, visual hallucinations are an important symptom because they are suggestive of cerebral ischemia or visual loss.