Abstract
Despite clinical examination, imaging, and laboratory testing, some uveitic or malignant processes may present a diagnostic dilemma. If noninvasive testing fails to provide a diagnosis, tissue biopsy may be considered for establishing the underlying etiology and guiding therapy. Advances in surgical technique and laboratory testing have allowed for safer tissue collection and increased diagnostic yield. This chapter will address the specific surgical techniques used to obtain tissue samples from the vitreous, retina, and choroid. It will also discuss methodologies commonly utilized to evaluate ocular biopsy specimens in clinical practice.