Table 1:

Response criteria for primary central nervous system lymphoma

Response	Brain Imaging	Corticosteroid Dose	Eye Examination Findings	CSF Cytology Findings
CR	No contrast enhancement	None	Normal	Negative
CRu	No contrast enhancement	Any	Normal	Negative
	Minimal abnormality	Any	Minor RPE abnormality	Negative
PR	50% Decrease in enhancing tumor	Irrelevant	Minor RPE abnormality or normal	Negative
	No contrast enhancement	Irrelevant	Decrease in vitreous cells or retinal infiltrate	Persistent or suspicious
PD	25% Increase in lesion	Irrelevant	Recurrent or new ocular disease	Recurrent or positive
	Any new site of disease: CNS or systemic

Note:—CRu indicates unconfirmed complete response; RPE, retinal pigment epithelium.