Objective: To analyze the clinical features of primary intraocular lymphoma (PIOL) and to describe cytochemical and immunocytochemical findings of the vitreous specimens as well as the reasons for delayed diagnosis of PIOL.
Design: Prospective noncomparative study.
Participants: Eleven patients referred to the uveitis or medical retina units, Department of Ophthalmology, University of Helsinki, were diagnosed as having PIOL between 2000 and 2005.