I received a letter from Dr. Walton M. Edwards, requesting us to acknowledge his report of an xanthogranuloma in the retroperitoneal space as the second case in the pediatric literature. Since our paper, "Retroperitoneal Xanthogranuloma"(Pediatrics, 30:608, 1962) was submitted for publication this paper by Captain Douglas H. Sandberg, M.C., and Colonel Walton M. Edwards, M.C., appeared in the British Journal of Urology, 34:47, 1962, reporting a case of xanthogranuloma of the retroperitoneal space in a 3-year-old male child. Our case is therefore the third to be reported in the pediatric age group and not the second as we reported.