An unusual case of solitary idiopathic pigmented vitreous cyst

Vitreous cysts are a rare finding and rarely cause any visual disturbances. They are often classified as idiopathic when their etiology cannot be determined. They may be congenital or acquired and pigmented or nonpigmented. In previous reports, it has been suggested on the basis of electron microscopy that these pigmented vitreous cysts may have originated from the pigment epithelium. We present the case of a 46-year-old female, with complaints of an oval-shaped floater, causing some visual disturbance in her right eye. On examination, it was found to be a pigmented, round, and nonlobulated cyst floating freely in the vitreous cavity with no attachments to the retina. This was documented and confirmed by the fundus images and optical coherence tomography findings. Laboratory tests in the patient were found to be negative for any Toxoplasma, cysticercoids, Echinococcus, and Toxocara, among others. She was on follow-up for the past 6 months with no change or disturbance in the cyst or the retinal findings. We describe a rare case of idiopathic pigmented vitreous cyst with no persistent hyaloid artery or connection between the cyst and the ocular structures.