Purpose Juvenile xanthogranuloma (JXG) is a rare histiocytic skin disease primarily of young children, which may also affect ocular structures and in particular the iris. Observations This is a case report of a fifty-year-old patient without skin lesions showing a progressive decrease of visual acuity, iris vascularization and a yellowish iris tumor in the iridocorneal angle of his right eye. Treatment with topical and systemic prednisolone led to full recovery of visual acuity, tumor regression and restitutio ad integrum . Conclusions and importance Although the juvenile xanthogranuloma is a very rare skin disease of young children, it may also affect the eye and in particular the iris in adult patients. There exists no standard treatment, the first-line therapy in most cases, however, is topical and systemic prednisolone application.
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