title: Pyonephrosis necessitans: a report of two cases.
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005402:Fistula / Q000209:etiology*; D005747:Gastric Fistula / Q000209:etiology; D006801:Humans; D007674:Kidney Diseases / Q000209:etiology*; D008171:Lung Diseases / Q000209:etiology; D011704:Pyelonephritis / Q000150:complications*