title: Rare calcium oxalate monohydrate calculus attached to the wall of the renal pelvis.
abstract: Most renal calculi can be classified using well-established criteria in a manner that reflects both composition and fine structure under specific pathophysiological conditions. However, when a large patient population is considered, rare renal calculi invariably appear, some of which have never been classified; careful study is required to establish stone etiology in such cases. The patient in the present case report formed two types of calculi. One was attached on the wall of the renal pelvis near the ureter and part of the calculus was embedded inside pelvic renal tissue. The calculus developed on an ossified calcification located in the pelvis tissue. Current knowledge on the development of calcification in soft tissues suggests a pre-existing injury as an inducer of its development. A mechanism of calculus formation is proposed. The second stone was a typical jack-stone calculus.
authors.affiliation: Laboratory of Renal Lithiasis Research, University Institute of Health Sciences Research, University of Illes BalearsUniversity Hospital of Son Dureta, Palma de MallorcaHospital of Manacor, Manacor, Spain.
authors.forename: Felix
authors.initials: F
authors.lastname: Grases
authors.forename: Antonia
authors.initials: A
authors.lastname: Costa-Bauza
authors.forename: Rafael M
authors.initials: RM
authors.lastname: Prieto
authors.forename: Carlos
authors.initials: C
authors.lastname: Saus
authors.forename: Antonio
authors.initials: A
authors.lastname: Servera
authors.forename: Reyes
authors.initials: R
authors.lastname: García-Miralles
authors.forename: Joan
authors.initials: J
authors.lastname: Benejam
mesh_terms: D000328:Adult; D002129:Calcium Oxalate / Q000032:analysis*; D006801:Humans; D007669:Kidney Calculi / Q000737:chemistry*; D007682:Kidney Pelvis; D008297:Male
chemical_list: D002129:Calcium Oxalate