title: Ectopic renal ossification as nucleus of urinary stones.
abstract: Areas of ectopic ossification were found in thin sections from 19 of 1,624 calculi submitted to a petrographic procedure, an incidence of 1.16 per cent. Only 8 calculi of renal, pelvic or ureteral origin with osseous tissue in its structure have been described since the first report by Phemister in 1923.
mesh_terms: D005260:Female; D006801:Humans; D007669:Kidney Calculi / Q000209:etiology; D007674:Kidney Diseases / Q000150:complications*; D008297:Male; D009999:Ossification, Heterotopic / Q000150:complications*; D014514:Ureteral Calculi / Q000209:etiology; D014545:Urinary Calculi / Q000209:etiology* / Q000473:pathology