title: [Pseudotumor in the parotid region].
abstract: Tophaceous pseudogout is a rare form of calcium pyrophosphate dihydrate (CPPD) crystal deposition disease. Half of the 31 reported cases of tophaceous pseudogout are in the head and neck region. This patient presented with a parotid tumour, that was initially suspected to be malignant based on radiology and cytology. Operation disclosed a tumour progressing to the base of the skull, histological examination showed inflammatory cells, macrophages, metaplastic chondroid cells and giant cells of foreign-body-type. X-ray diffraction revealed two crystal forms of CPPD.
authors.affiliation: H:S Rigshospitalet, øre-, naese- og halsklinikken.
authors.forename: H B
authors.initials: HB
authors.lastname: Olin
authors.forename: K
authors.initials: K
authors.lastname: Pedersen
authors.forename: H
authors.initials: H
authors.lastname: Hansen
authors.forename: F W
authors.initials: FW
authors.lastname: Poulsen
mesh_terms: D002805:Chondrocalcinosis / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008875:Middle Aged; D010307:Parotid Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D014057:Tomography, X-Ray Computed