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• W1934512076 abstract "Desmoplastic fibroma of bone, a rare, benign but locally aggressive tumor, accounts for less than 0.1% of all primary bone tumors and typically affects adolescent and young adults1,2. It is considered the bony counterpart of the much more common desmoid tumors of soft tissue. The long tubular bones are most often involved3,4. Here we report a case of desmoplastic fibroma of the right ilium in a 49-year-old female patient and describe its clinical, radiological, and pathological features. A 49-year-old female patient presented to our hospital with an abnormal finding in her right ilium after a conventional radiographic examination. She was able to walk normally and experienced no discomfort. Physical examination showed mild tenderness of her right ilium. LaboStarting export: ratory findings were all within normal limits. A plain X-ray film showed a large osteolytic bony lesion with a well-demarcated margin in the wing of the right ilium. Delicate and diffuse trabeculation with an expansile appearance was observed (Fig. 1). CT demonstrated a lytic expansile lesion with a thin rim and remnant trabeculae in her right ilium (2, 3). The characteristic radiographic findings and clinical signs suggested this was a benign iliac tumor. Preoperative diagnosis included osteofibrous dysplasia, nonossifying fibroma and desmoplastic fibroma of bone. Anteroposterior radiograph of the pelvis showing a large osteolytic bony lesion with a well-defined margin and diffuse trabeculation in the wing of the right ilium. Coronal reconstruction of CT film of the pelvis clearly showing a lytic expansile lesion with a thin rim in the right ilium. Sagittal reconstruction of Ct film of the ilium revealing remnant trabeculae in the expansible lesion. After surgical exposure the mass was found to be yellowish-white and to have a rubbery consistency on macroscopic examination. The bone surrounding the lesion was sclerotic and some serous fluid was observed (Fig. 4). A quick preliminary pathological examination during the operation showed proliferation of bland-looking spindle cells in abundant collagenous stroma and a provisional diagnosis of desmoplastic fibroma of the right ilium was made. Wide resection of the lesions was advocated. Pathological examination after surgery confirmed a typical desmoplastic fibroma of ilium with slender fibroblasts surrounded by collagen fibers in wavy and interlacing bundles (Fig. 5). Grossly, the mass is well demarcated and yellowish-white with a rubbery consistency. Bundles of spindle cells with abundant intercellular collagen are visible on pathological examination (hematoxylin and eosin ×100). Desmoplastic fibroma of bone is a very rare, fibrogenic, benign primary bone tumor characterized by local recurrence after simple curettage and was first described by Jaffe in 19585. It has been reported in all age groups, but is more common in the second and third decades6. The meta-epiphyseal regions of the tubular bones are most often involved. Pain and swelling are the commonest presenting symptoms1,6,7. The classical radiographic appearance is that of an expansile and osteolytic bony lesion with well-defined margins. Delicate and diffuse trabeculation with an expansile appearance is typically visible on plain radiography8. CT scan shows a well-circumscribed low density area with a thin cortex or, sometimes, destruction of the overlying cortex. On MRI desmoplastic fibroma, like other fibrous tumors, may show low signal intensity on T1- and T2-weighted images9. Grossly, the tissue of the lesion is grayish- or yellowish-white and dense, resembling soft-tissue desmoid lesions. It also resembles these lesions microscopically; being hypocellular and fibroblastic and containing bland-looking spindle cells in abundant collagenous stroma10. As for the histological differential diagnosis, desmoplastic fibroma of bone needs to be distinguished from fibrosarcoma, malignant fibrous histiocytoma, nonossifying fibroma and fibrous dysplasia. A lack of mitotic figures, hypercellularity and pleomorphism help to distinguish this tumor from malignant tumors such as fibrosarcoma and malignant fibrous histiocytoma. Fibroblastic proliferation with abundant cellularity and giant cells and foam cells are usually seen in nonossifying fibroma. Absence of osteoid tissue formation differentiates desmoplastic fibroma from fibrous dysplasia6,7,11. Wide resection is the treatment of choice for this benign but locally aggressive bone tumor. Jun et al. reported that treatment with aggressive curettage could achieve clinical and radiographic control of this tumor8. They reported no recurrences in five patients who underwent aggressive curettage, the follow-up periods ranging from 5 years 6 months to 9 years. Adjuvant treatments have been reported to be effective for treating soft-tissue desmoid tumors (e.g., radiation, anti-inflammatory agents, and cytotoxic agents). Altsmann et al. reported that the recurrence rate of fibromatosis can be reduced significantly by adjuvant radio-therapy12, but few data support these approaches as solitary treatment for desmoids tumors in bone. In conclusion, desmoplastic fibroma of bone is a rare fibrogenic bone tumor characterized by local aggression and recurrence after simple curettage. An expansile and osteolytic bony lesion with well-defined margins and diffuse trabeculation can be seen on radiographic images. Pathological examination is important in diagnosing this rare entity and excluding other lytic bone lesions. As for therapy, surgical resection is the treatment of choice and periodic follow-up is advocated. The authors declare that there are no competing interests in this research." @default.
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• W1934512076 date "2011-07-25" @default.
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• W1934512076 title "Desmoplastic fibroma of ilium" @default.
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• W1934512076 doi "https://doi.org/10.1111/j.1757-7861.2011.00136.x" @default.
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