 This patient had isolated or predominant tubulointerstitial lupus nephritis, which is a rare form of lupus nephritis. The patient responded well to treatment with high-dose oral steroids and azathioprine, and his renal function improved significantly within a short period of time. This suggests that this type of lupus nephritis may have a favorable prognosis if treated early and aggressively. This article was authored by Allah Ali and Swad Al Windawee.