title: Extraskeletal chondroma with chondroblastic and granuloma-like elements.
abstract: A unique case of extraskeletal chondroma occurring in the right ring finger of a 51-year-old man is reported. The tumor, measuring 4.0 x 2.2 x 1.5 cm, consisted of chondroid, granuloma-like, and chondroblastic cell zones associated with fine calcification. Immunohistochemically, most of the tumor cells except for multinucleated giant cells were positive for vimentin. Cells positive for S-100 protein were scattered throughout the tumor, and cells positive for alpha-1 antichymotrypsin were observed in the chondroblastic cell zone and in the granuloma-like area. Ultrastructurally, the chondroblastic cells had a characteristic microvillous cell border.
authors.affiliation: Department of Pathology, Saga Medical School, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yamada
authors.forename: T
authors.initials: T
authors.lastname: Irisa
authors.forename: S
authors.initials: S
authors.lastname: Nakano
authors.forename: O
authors.initials: O
authors.lastname: Tokunaga
mesh_terms: D002812:Chondroma / Q000473:pathology* / Q000648:ultrastructure; D005385:Fingers; D006099:Granuloma / Q000473:pathology; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D012983:Soft Tissue Neoplasms / Q000473:pathology* / Q000648:ultrastructure