title: Synovial fluid oxalate deposition complicating rheumatoid arthritis with amyloidosis and renal failure. Demonstration of intracellular oxalate crystals.
abstract: A patient with quiescent rheumatoid arthritis, amyloidosis and chronic renal failure developed an inflamed knee. Intracellular bipyramidal crystals characteristic of oxalate were found and are suggested as the cause of the acute arthritis. Since the patient had been treated with vitamin C, this precursor of oxalate is proposed as a possible factor in the crystal deposition.
mesh_terms: D000686:Amyloidosis / Q000150:complications*; D001172:Arthritis, Rheumatoid / Q000150:complications* / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology; D001205:Ascorbic Acid / Q000627:therapeutic use; D006801:Humans; D007676:Kidney Failure, Chronic / Q000150:complications* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D010070:Oxalates / Q000378:metabolism*; D019815:Oxalic Acid; D010530:Peritoneal Dialysis; D011859:Radiography; D013582:Synovial Fluid / Q000378:metabolism*
chemical_list: D010070:Oxalates; D019815:Oxalic Acid; D001205:Ascorbic Acid