Korean J Radiol.  2009 Feb;10(1):85-88. 10.3348/kjr.2009.10.1.85.

Fibroblastic Type Osteosarcoma of the Ulna: a Case Report of a Tumor in a Rare Location with Atypical Imaging Findings

• Joo I
• Choi JA
• Chung JH
• Oh JH
• Hong SH
• Kang HS

• KMID: 1088683
• DOI: http://doi.org/10.3348/kjr.2009.10.1.85

Abstract

The ulna is a rare site of origin for osteosarcoma, and purely osteolytic osteosarcomas are uncommonly noted on conventional radiographs. We present a patient with a lytic lesion of the distal ulna for which imaging findings suggested an aneurysmal bone cyst. The lesion was histologically confirmed to be a fibroblastic osteosarcoma.

Keyword

Bone neoplasm, ulna; Osteosarcoma; Radiography; Magnetic resonance (MR)

MeSH Terms

Adult
Bone Neoplasms/*diagnosis/pathology
Female
Humans
Magnetic Resonance Imaging
Osteosarcoma/*diagnosis/pathology
Tomography, X-Ray Computed
*Ulna

Figure

• 

  Fig. 1 Imaging findings of fibroblastic osteosarcoma in distal ulna of 37-year-old woman. A. PA view of right wrist reveals well-marginated osteolytic lesion of slightly expansile nature with suspicious focal cortical disruptions (arrows) in distal ulna metaphysis and epiphysis. B. Coronal T2-weighted (TR/TE = 2925/54), fat-suppressed MR imaging shows multi-loculated, high signal intensity lesion in distal ulna. C. Axial T2-weighted (TR/TE = 4319/100) MR imaging shows fluid-fluid levels within cystic lesion. D. Sagittal T1-weighted (400/18.46) MR imaging reveals cortical disruptions (white arrows). E. On gadolinium-enhanced, fat-suppressed, T1-weighted (517.9/20) MR imaging, focal enhancement of lesion (white arrows) is noted along with largely non-enhancing portions. F. Large part of tumor is composed of spindle cells, often in "herringbone" pattern (Hematoxylin & Eosin staining, ×200). G. Focal osteoid production by neoplastic stromal cells (Hematoxylin & Eosin staining, ×400).

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