The authors report a case of unusual toxoplasma chorioretinitis presenting a branch retinal occlusion of an artery passing through the acute necrotic focus. This complications has been very rarely described previously and may have been caused by the acute retinal necrosis. Arterial inflammatory phenomena constitute another etiologic hypothesis. As this branch vascular obstruction may change the appearance of the fundus and obscure the initial inflammatory focus, ocular toxoplasmosis should be included in the differential diagnosis of branch retinal vascular occlusion associated with posterior uveitis, particularly in young patients.