title: Tophaceous pseudogout: a pitfall in the diagnosis of chondrosarcoma.
abstract: Tumoral calcium pyrophosphate dihydrate deposition disease (TCPPD, tumoral or tophaceous pseudogout) is a rare nonneoplastic entity which mimics soft-tissue or skeletal malignancy. We present here the fine-needle aspiration cytology findings of a unique case of TCPPD in a 76-yr-old woman, with a large paraischial soft-tissue mass diagnosed as a malignant neoplasm. The difficulty in diagnosing such lesions by fine-needle aspirates is discussed and reviewed in the context of known cases from the literature.
authors.affiliation: Department of Pathology and Laboratory Medicine, UCLA Medical Center, Los Angeles, California 90095-1763, USA.
authors.forename: N
authors.initials: N
authors.lastname: Lambrecht
authors.forename: S D
authors.initials: SD
authors.lastname: Nelson
authors.forename: L
authors.initials: L
authors.lastname: Seeger
authors.forename: S
authors.initials: S
authors.lastname: Bose
mesh_terms: D000368:Aged; D001707:Biopsy, Needle; D001859:Bone Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology; D002131:Calcium Pyrophosphate / Q000378:metabolism; D002805:Chondrocalcinosis / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology; D002813:Chondrosarcoma / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D011859:Radiography
chemical_list: D002131:Calcium Pyrophosphate