The idiopathic uveal effusion syndrome is a rare disease characterized by serous choroidal detachment. The pathogenesis of idiopathic effusion syndrome has not been conclusively determined yet. One hypothesis postulates compression of the vortex veins and abnormal diffusion of extravascular proteins. A possible complication of the disease is retinal detachment. We present a case of 59-year-old woman with idiopathic uveal effusion in the left eye. The uncorrected visual acuity was 5/5 in both eyes. Ultrasonography, ultrasound biomicroscopy, spectral optical coherence tomography and magnetic resonance imaging were performed, which excluded secondary causes of the disease. Spontaneous resolution was observed over a two-week period, without the recurrence in one-year follow up. The diagnosis was based on the clinical exam findings. The uveal effusion syndrome may be idiopathic, although in the majority of patients it is secondary to other ocular conditions, such as hypotony or inflammation.