[Diagnostic Strategy and Therapeutic Dilemma in Acute Posterior and Panuveitis].

Acute posterior and panuveitis mostly affect younger patients and affect both eyes in more than half of cases. Because of the severe consequences in the clinical course, rapid and broad differential diagnosis are critical steps. Permanent loss of vision after a delay in starting therapy and the initiation of ineffective treatment are both serious risks. The initial diagnostic classification is based on clinical presentation (anatomical localisation and type of inflammation) and clinical course and, secondarily, on the response to acute therapy. The aetiology is acute in as many as one third of cases. The most frequent acute posterior uveitis in immunocompetent persons is acute viral retinal necrosis. It is difficult to distinguish this clinically from Behçet uveitis, as long as there are no systemic manifestations. In patients with disease threatening the macula, high dose steroid therapy must be started no later than 24 hours after the start of antiviral and anti-parasitic acute therapy. Thus, misdiagnosis has therapeutic consequences. Moreover, the prognosis is favourably affected by aggressive treatment of acute posterior uveitis. Any delay in starting therapy increases infectious and inflammatory tissue damage, and increases the risk of involvement of the other eye and of other organs. On the other hand, the use of high doses of steroids, immunosuppressives and biological agents can lead to uncontrolled proliferation of the pathogen and relapses.