Lanthanum carbonate is a new nonaluminium, noncalcium phosphate binder. The drug is well-tolerated its side-effects seem comparable to those of other phosphate binders. The most frequent side-effects are gastrointestinal complications. Cerny [New England Journal of Medecine 355(2006)1160.] and Kunzendorf have recently reported another effect of lanthanum carbonate based on its radiographic characteristics. We report another case of opacification of the intestine with lanthanum carbonate which underlines some difficulties in the use of this new phosphate binder.