Immunohistochemical and Immunocytochemical Analyses in Patients with Vitreoretinal Lymphoma.

: The aim of this study was to analyze immunohistochemical and immunocytological findings by examining enucleated eyes and vitreous cell block (CB) in patients with vitreoretinal lymphoma (VRL).: Histological specimens were obtained from two enucleated eyes with VRL associated with neovascular glaucoma. CB specimens were prepared in 18 patients from diluted waste fluids containing shredded vitreous. Histological and cytological specimens were submitted for hematoxylin-eosin staining and immunopathological analyses.: Both specimens demonstrated massive infiltration of large lymphoma cells. The lymphoma cells were positive for CD20 and MUM-1 in enucleated eyes. Membranous immunoreactivity for CD20 was observed in lymphoma cells in CB with VRL. Bcl-6 and MUM-1 were marked in five and eight out of nine cases examined, respectively: Cytological findings in CB specimens indicated similar histopathological characteristics of enucleated eyes. CB specimens obtained from vitreous waste diluted fluids may serve as effective materials for cytological diagnosis of VRL.