title: Bone formation in the urinary tract: case report.
abstract: A case of osseous metaplasia of the ureter presenting as a small upper-ureteral calculus is reported. This rare phenomenon may represent an unusual nucleus for stone formation in the urinary tract. The etiology of this condition is uncertain; we speculate that trauma to the ureter may stimulate osseous metaplasia.
authors.affiliation: Scottish Lithotriptor Centre, Western General Hospital, Edinburgh, UK. susanwillis303@hotmail.com
authors.forename: Susan F
authors.initials: SF
authors.lastname: Willis
authors.forename: Simon V
authors.initials: SV
authors.lastname: Bariol
authors.forename: David A
authors.initials: DA
authors.lastname: Tolley
mesh_terms: D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008679:Metaplasia / Q000175:diagnosis; D008875:Middle Aged; D009999:Ossification, Heterotopic / Q000175:diagnosis*; D014513:Ureter / Q000473:pathology*; D014514:Ureteral Calculi / Q000175:diagnosis; D018666:Ureteroscopy; D014570:Urologic Diseases / Q000175:diagnosis*