Worsening of Retinal Detachment after Cataract Surgery in the Eye with Persistent Fetal Vasculature

Purpose To report a case of persistent fetal vasculature (PFV) with a retinal detachment that worsened after cataract surgery. Pars plana vitrectomy (PPV) was performed which reduced the vitreous traction and reattached the retina. Observations. A 20-year-old Myanmarese woman presented with a mature cataract, and her vision was light perception. She underwent uneventful cataract surgery with implantation of an intraocular lens. Her visual acuity improved to 20/200 immediately after the surgery. However, fibrotic tissue was observed between the optic nerve head and the posterior capsule. She was diagnosed with PFV, and she was followed without any intervention. One and a half years after the cataract surgery, she had an advanced retinal detachment which extended over the inferior two quadrants. Her vision deteriorated to 20/400. She underwent PPV, and the PFV tissue was removed which resulted in the reattachment of the retina. The visual acuity improved to 20/60. Conclusions Surgeons should be aware that it is possible to worsen a retinal detachment after cataract surgery in the eyes with PFV. A simple technique to release the anterior-posterior traction by the PPV was sufficient to achieve the reattachment of the retina.


Introduction
Persistent fetal vasculature (PFV) which was previously called persistent hyperplastic primary vitreous (PHPV) is a rare congenital ocular disorder [1]. PFV is characterized by unilateral cataract, persistent vascularized hyaloid, retrolental tissues, microphthalmos, and retinal detachment [2]. PFV is usually diagnosed in childhood because the eyes with PFV usually have poor visual function, leukocoria, and strabismus. ese changes alert the parents that the eyes are not normal. Phacoemulsification of the cataract and insertion of an intraocular lens is usually performed on these children, and the postsurgical outcomes are generally good [3].
We have had a case of PFV in an adult Myanmarese woman, and she was initially treated for her advanced cataract with phacoemulsification and implantation of an intraocular lens. After the cataract surgery, there was worsening of the retinal detachment, but we successfully reattached the retina by a simple PPV with removal of the connecting tissue in the retrolental space and optic nerve head.

Case Report
A 20-year-old Myanmarese woman who was aware of a declining vision in her left eye for three years was diagnosed with a mature cataract in her left eye. She was referred to Chiba University Hospital for further examination and treatment for the cataract. She had no medical history of the left eye, although detailed medical records were not available because she had grown up in Myanmar and had recently moved to Japan to receive occupational training. She did not have any systemic disease and abnormalities. e laboratory tests for infectious diseases were negative. She stated that she was born at full-term and had no family history of retinal detachment. Her left vision was light perception at our first examination. She had a mature cataract with a slightly shallow anterior chamber and the absence of inflammation and iris neovascularization. e dense cataract prevented a detailed examination of the fundus, but B-mode echogram showed some strands of high signals extending anteriorly from the optic nerve head (Figure 1). Her right eye was normal with a vision of 20/20. e intraocular pressure was 18 mmHg OD and 18 mmHg OS. e axial length was 23.78 mm in the right eye and 23.46 mm in the left eye.
She underwent phacoemulsification and implantation of an intraocular lens in her left eye. e surgery was completed without any complications, and the postoperative course was uneventful with a recovery of the left vision to 20/200. A stalk was observed between the optic nerve and posterior capsule, but the retinal detachment was limited to the retina around the optic nerve. One and a half years after the initial surgery, she noticed a decline of the vision in her left eye, and her visual acuity was 20/400. e area of retinal detachment extended over two quadrants of the inferior retina ( Figure 2). ere were no retinal breaks. A macula involved detachment was confirmed by optical coherence tomography. PPV with a 27-gauge system was performed, and the stalk was incised with a vitrectomy cutter. Some parts of the stalk were left attached to the optic nerve not to damage the anteriorly stretched retina. No additional procedures such as membrane peeling, drainage of subretinal fluid, and the fluid-air exchange were performed. e posterior vitreous was not

Discussion
e eyes with PFV are characterized by cataracts, vascularized persistent hyaloid, retrolental tissue, microphthalmos, and retinal detachment. e retinal detachment sometimes presents as a falciform retinal detachment, and it usually extends from the optic nerve to the inferior temporal region. e visual function in the eyes with PFV is usually poor because of the involvement of macula by the retinal detachment, severe macular deformity, and refractory glaucoma. Despite recent extensive surgical interventions and visual rehabilitations, the treatment of PFV is still challenging. Dass et al. reported that the final visual acuity was better than 20/800 6 in 35 eyes (17%) [4], and Alexandrakis et al. reported that 14 in 30 eyes (47%) achieved a final visual acuity of 20/400 or better [5].
We presented a PFV case with a visual decrease after cataract surgery and visual improvement after PPV. Before the cataract surgery, we could not diagnose the PFV because of the poor visibility of fundus caused by a fibrovascular tissue that extended from optic nerve head to posterior lens capsule. We speculated that this PFV tissue caused the anterior-posterior traction on the optic disc and surrounding retina to cause the development of the retinal detachment. Previous histological studies reported that the PFV stalk contained vascular tissues and fibrovascular connective tissue with mesodermal hyperplasia with smooth muscle actin [6]. ese tissues exerted contractile force when they regressed. Our second approach by PPV was effective in reducing retinal detachment because we released the traction by cutting the stalk. Another option was posterior capsulotomy and anterior vitrectomy to remove retrolental tissue [3]. However, we were not confident of the intraoperative diagnosis of PFV and avoided further invasive procedures. e characteristics of the OCT findings of PFV have been well summarized [7]. e retinal layer structure near the falciform retinal detachment was relatively well maintained except for the peripheral temporal region which showed marked thinning and disorganized retinal layer structures. In our case, the foveal configuration was well preserved after the absorption of subretinal fluid, and it was associated with relatively good postoperative vision. e restoration of external limiting membrane and ellipsoid zone could not be confirmed probably because of the chronic retinal detachment.
In conclusion, we experienced a PFV case that had worsening of retinal detachment after uneventful cataract surgery. e retinal detachment was successfully treated by simple vitrectomy. We suggest that the vasoproliferative tissue played a role in the development and resolution of retinal detachment. Although PPV was effective, posterior capsulotomy with anterior vitrectomy is one option to prevent worsening of the retinal detachment.

Data Availability
No data were used to support this study.