Periosteal osteoblastoma : report of a case with a rare histopathologic presentation and review of the literature

• Published in: Skeletal radiology 2007-03, Vol.36 (3), p.259-264
• Main Authors: JAVAD MORTAZAVI, S. M, WENGER, Doris, ASADOLLAHI, Saeed, SHARIAT TORBAGHAN, Shams, KRISHNAN UNNI, K, SABERI, Sadegh
• Format: Article
• Language: English
• Subjects: Adult; Biological and medical sciences; Bone Neoplasms - diagnosis; Bone Neoplasms - pathology; Bones; Diagnosis, Differential; Diseases of the osteoarticular system; Female; Humans; Knee Joint - pathology; Magnetic Resonance Imaging; Medical sciences; Osteoblastoma - diagnosis; Osteoblastoma - pathology; Periosteum - pathology; Tomography, Emission-Computed; Tomography, X-Ray Computed; Tumors of striated muscle and skeleton
• ISSN: 0364-2348; 1432-2161
• DOI: 10.1007/s00256-006-0169-2

Osteoblastoma is an uncommon benign bone tumor most commonly located in the vertebral column or metaphysis of a long bone. Periosteal location is rare. We report a periosteal-based osteoblastoma, arising from the proximal tibia, in a 20-year-old woman who presented with knee swelling and pain of 2-year duration. Imaging studies showed a metaphyseal surface-based lesion with patchy radiodensities. The cortico-medullary junction was intact. The lesion was totally excised. Histopathologic evaluation disclosed immature bone and osteoid deposition in a vascularized stroma, associated with numerous osteoblasts and osteoclasts rimming the bony trabeculae. Plate-like arrangements of cartilage in the margin of the neoplastic tissue were also identified. At 16 months postoperatively, the patient was well without recurrence. Although extremely unusual, the presence of cartilage does not necessarily exclude the diagnosis of osteoblastoma.