title: Tumoral calcium pyrophosphate deposition disease.
abstract: A report of two patients in which a soft tissue mass, initially regarded as a malignant tumor, was shown to be the result of calcium pyrophosphate deposition disease. The first case, a woman aged 71 years, presented with a mass involving the right fifth finger. In the second case, also a woman aged 71 years, the lesion involved the tissues adjacent to the right hip. Each lesion consisted of a mass of highly cellular tissue containing deposits of calcium pyrophosphate dihydrate crystals. The clinical, radiological, and pathological features of the two cases are compared with those of seven similar cases reported in the literature.
authors.affiliation: Hospital for Joint Diseases Orthopaedic Institute, New York, NY 10003.
authors.forename: H A
authors.initials: HA
authors.lastname: Sissons
authors.forename: G C
authors.initials: GC
authors.lastname: Steiner
authors.forename: F
authors.initials: F
authors.lastname: Bonar
authors.forename: M
authors.initials: M
authors.lastname: May
authors.forename: Z S
authors.initials: ZS
authors.lastname: Rosenberg
authors.forename: H
authors.initials: H
authors.lastname: Samuels
authors.forename: D
authors.initials: D
authors.lastname: Present
mesh_terms: D000368:Aged; D001859:Bone Neoplasms / Q000175:diagnosis; D002131:Calcium Pyrophosphate / Q000378:metabolism*; D002805:Chondrocalcinosis / Q000000981:diagnostic imaging / Q000473:pathology; D003937:Diagnosis, Differential; D011756:Diphosphates / Q000378:metabolism*; D004577:Electron Probe Microanalysis; D005260:Female; D005385:Fingers; D006615:Hip; D006801:Humans; D008855:Microscopy, Electron, Scanning; D011859:Radiography; D014961:X-Ray Diffraction
chemical_list: D011756:Diphosphates; D002131:Calcium Pyrophosphate