Free-floating Vitreous Cyst in an Adult Male
In December 2010, a 50 year-old male was referred to our clinic due to a floating mass in his right eye. The patient complained about floaters in the right eye which he had experienced since childhood. The patient`s uncorrected visual acuity was 10 / 10 in both eyes and he did not have any systemic disorder or history of trauma. His ophthalmological examination revealed an unremarkable anterior segment with no signs of inflammation. The intraocular pressure was 16 mmHg and 15 mmHg in the right and left eyes, respectively.\nIndirect opthalmoscopy and posterior segment biomicroscopy performed with a 90D lens were unremarkable in the left eye, but a single, oval 6×5 mm diameter cyst was identified in the right eye, floating freely in the vitreous. The cyst was partially masking the underlying retinal vasculature (). Optical coherence tomography was normal in both eyes. A B-scan ultrasound revealed an echo-free, round-shaped cyst that was free from surrounding vitreous strands and retina, and was located in the posterior vitreous (). Fluorescein angiography (FA) ruled out the presence of intra- and overlying vascularization of the cyst. Indeed, FA showed a clear-edged hypofluorescence due to a pre-retinal masking effect ().\nThe indirect hemagglutinin tests of the patient for ecinococcus and cysticercosis were negative. Eosinophilia was not detected in the preripheral blood smear. Ultrasonography of the liver, spleen and kidney revealed no pathology. Based on these findings the patient was diagnosed with a primary vitreous cyst.