Periodic alternating nystagmus induced by light stimulation: A case report and review of literature

Abstract

Periodic alternating nystagmus (PAN) is a rare form of nystagmus that periodically changes direction. Herein, we report the case of a patient with PAN induced by light stimulation.There are few reports of nystagmus induced by light stimulation, and no cases of PAN induced by light stimulation have been reported in literature. This case is a 72-year-old male with diabetes and hypertension having a chief complaint of dizziness. He felt dizzy particularly when he walked in the sun amongst the trees. On an equilibrium function test, PAN was observed with Frenzel goggles; however, it disappeared without Frenzel goggles or infrared CCD camera. Two years later, a necrotic lesion appeared on the skin of the patient's right heel. The patient was examined by the department of plastic surgery and diagnosed with malignant melanoma. He underwent surgical treatment for the same following which, PAN improved.

Keywords

• Vertigo
• PAN
• Spinocerebellar degeneration
• Light stimulate
• Melanoma