PARS-PLANA INCISIONS OF 4 PATIENTS - HISTOPATHOLOGY AND ELECTRON-MICROSCOPY

The pathology of pars plana incisions of four patients is described: t hree with light microscopy and one with light and electron microscopy. Two eyes were removed because of choroidal melanoma, immediately and 8 days after vitrectomy and transvitreous retinal biopsy. Considerable disruption of tissues surrounding the pars plana incisions was observ ed. Vitreous was incarcerated in the wounds, which healed with granula tion tissue. One eye was examined 4 months after vitrectomy for diabet ic retinopathy and a failed pars plana filtering operation. It contain ed fibrovascular ingrowth from all the incisions, infiltrating the vit reous base with granulation tissue and causing vitreous haemorrhage an d retinal detachment. One eye was removed 1 year after vitrectomy for anterior hyaloidal fibrovascular proliferation and early phthisis. The wound had fibrous ingrowth histologically and evidence of active fibr oplasia.