A case of frosted branch angiitis in an immunocompromised child.

Frosted branch angiitis is a rare vascular reaction believed to be a nonspecific immune response to an infective, neoplastic, or idiopathic insult. The clinical presentation is characteristic and typically affects children and younger adults, and the prognosis is good. We report a case of frosted branch angiitis during immune recovery in a 2-year-old boy with Langerhans cell histiocytosis on systemic immunosuppressive therapy.