Clinical findings of calcium oxalate (CaOx) deposits in PH1. Clinical findings of calcium oxalate (CaOx) deposits in PH1. (A) X-ray (plain film of the abdomen), demonstrating multiple kidney stones (some with a staghorn appearance) in a 7-yr-old patient with PH1 and renal failure. A double-J catheter was placed in the right ureter. Initial oxalate osteopathy, with cystic lesions in both femoral necks and pelvic bones, can also be observed. (B) Ultrasonogram (right kidney), demonstrating a “white” kidney, attributable to diffuse nephrocalcinosis, in a 3-mo-old patient with renal failure. (C) Eyeground examination image (6-yr-old patient), demonstrating numerous pitch-black foci (consisting of multiple layers of hyperplastic and hypertrophic retinal pigment epithelium) and multiple CaOx crystals in the inner retina. ERNST LEUMANN, and BERND HOPPE JASN 2001;12:1986-1993 ©2001 by American Society of Nephrology