title: "Beaded" osteoid osteoma: a possible transition between solitary and multicentric tumor.
abstract: An extremely rare example of an elongated (3 cm) osteoid osteoma is presented. The tumor demonstrated three focal enlargements connected by narrow areas, suggesting a "string of beads" in appearance. The elongated shape suggested the possibility that lesional tissue was stretched in a longitudinal fashion as a result of the rapid skeletal growth. The tumor closest to the growth plate was densely ossified, while the furthest lesion was almost completely lytic, suggesting that the tumor enlarged in a centripetal direction. This case is believed to illustrate a continuum from solitary to multicentric osteoid osteoma. The tumor was treated successfully with three separate percutaneous radiofrequency ablations during a single session.
authors.affiliation: Department of Radiology, Taipei Veterans General Hospital, 201 Sec. 2 Shih-Pai Road, 11217 Taipei, Taiwan.
authors.forename: Yi-You
authors.initials: YY
authors.lastname: Chiou
authors.forename: Daniel I
authors.initials: DI
authors.lastname: Rosenthal
authors.forename: Andrew E
authors.initials: AE
authors.lastname: Rosenberg
mesh_terms: D002648:Child; D005260:Female; D005266:Femoral Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D010017:Osteoma, Osteoid / Q000000981:diagnostic imaging* / Q000473:pathology; D014057:Tomography, X-Ray Computed