Diagnostic yield of vitreous biopsy in presumed sarcoidosis-related posterior segment inflammation

Purpose Diagnostic vitrectomy is frequently used to help establish a diagnosis in challenging uveitis cases. The usefulness of this procedure in patients with suspected sarcoidosis with posterior segment involvement, in whom a diagnosis cannot be determined by conventional methods, has not been well-described. We hypothesized that diagnostic vitrectomy would help establish a diagnosis of presumed sarcoidosisrelated posterior segment inflammation in these challenging cases, and evaluated the diagnostic yield of vitreous biopsy in these eyes. Design Retrospective interventional case series. Methods Diagnostic vitrectomy was performed on eyes with intermediate, posterior, or panuveitis in which an etiology could not be characterized by history, clinical examination, ancillary testing, and/or laboratory testing. Retrospective chart review was conducted on consecutive eyes that underwent diagnostic, or diagnostic and therapeutic vitrectomy by a single surgeon between January 1989 and June 2006. Results Diagnostic and therapeutic vitrectomy was performed on 150 eyes. The final diagnosis was established by positive vitreous fluid analysis in 63 eyes (42 %). Eight of these vitreous specimens (5.3 %) yielded cytopathology consistent with presumed sarcoidosis-related posterior segment inflammation. Conclusions Sarcoidosis can cause characteristic inflammatory changes in the vitreous. In the appropriate clinical setting, cytopathologic assessment of these inflammatory changes observed in vitreous specimens can support the diagnosis of presumed sarcoidosis-related posterior segment inflammation, and help direct clinical management.