Clinical Report: Vitreous cyst may hide behind chronic floaters

Overview

A case report describes a 51-year-old woman with more than 20 years of left-eye floaters, in whom examination and multimodal imaging identified a mobile, free-floating pigmented vitreous cyst. Pars plana vitrectomy removed the cyst; at 2 weeks, the patient reported symptom relief and visual acuity improved from 20/60 to 20/25. The single-patient report and short postoperative follow-up limit generalization.

Background

Floaters are a common complaint and may arise from several causes, including vitreous degeneration, hemorrhage, or posterior vitreous detachment. The supplied context notes that rare free-floating vitreous cysts can also cause persistent floater symptoms and may be mistaken for more common vitreous changes. Evaluation in this case included dilated fundus examination, multimodal imaging, and assessment for inflammatory or parasitic disease. The related review, “Diagnosis of Floaters,” describes an organized approach to differential diagnosis, examination, and testing.

Data Highlights

Key Findings

• The patient had persistent left-eye floaters for more than two decades, with symptoms recently becoming more bothersome.
• Fundus examination and multimodal imaging showed a mobile, free-floating pigmented vitreous cyst with a translucent lumen and no attachment to the optic disc or peripheral retina.
• There were no signs of intraocular inflammation, and serologic testing for parasitic infection was negative.
• Histopathology showed a cyst wall lined by pigmented cuboidal epithelial cells, supporting an origin from the pigmented epithelium of the iris or ciliary body.
• At 2 weeks after pars plana vitrectomy, the patient reported symptom relief and visual acuity had improved from 20/60 to 20/25.
• The authors noted that vitrectomy may be considered in selected symptomatic cases when complete removal and histopathologic confirmation are desired; the report involved one patient and only 2 weeks of postoperative assessment.

Clinical Implications

The case authors state that a free-floating vitreous cyst should be considered in the differential diagnosis of persistent floaters, and that careful dilated fundus examination, multimodal imaging, and exclusion of inflammatory or parasitic disease may establish the diagnosis. They note that vitrectomy may be considered in selected symptomatic cases, particularly when complete removal and histopathologic confirmation are desired; this single case does not establish outcomes beyond the reported short follow-up.

Conclusion

This case documents a pigmented vitreous cyst presenting with longstanding floaters and symptom relief after surgical removal at 2 weeks. Its findings should not be generalized beyond the individual patient.

Related Resources & Content

1. Ngo Thi Hong Tham et al., JFO Open Ophthalmology, year not provided — Vitreous cyst may hide behind chronic floaters
2. Thomas A. Mendel, MD, PhD, Retinal Physician, 2022 — Diagnosis of Floaters
3. American Academy of Ophthalmology EyeWiki, year not provided — Vitreous Cysts
4. retinal physician — Diagnosis of Floaters
5. retinal physician — Video Optical Coherence Tomography for Visualization and Assessment of Vitreous Opacities
6. retinal physician — Controversies in Care
7. Vitreous Cysts - EyeWiki
8. Diagnosis of Floaters
9. YAG laser vitreolysis for symptomatic vitreous floaters
10. Intraoperative Characteristics and Postoperative Complications of Primary Vitrectomy for Vitreous Floaters - PubMed