The Standardization of Uveitis (SUN) Working Group reported criteria for the diagnosis of acute retinal necrosis (ARN) syndrome.
Criteria for the diagnosis of acute retinal necrosis - all of the following:
(1) necrotizing retinitis involving the peripheral retina
(2) one or both of the following:
(2a) positive PCR for Herpes simplex virus or Varicella Zoster virus
(2b) all of the following:
(2b1) circumferential or confluent retinitis
(2b2) retinal vascular sheathing and/or occlusion
(2b3) more than minimal viritis
(3) exclusion of
(3a) syphilis
(3b) toxoplasmosis
(3c) CMV
