ArticleJournal of pathology and translational medicine2026
Fibrosarcoma of bone masquerading as fibrous dysplasia: diagnostic pitfall and molecular correlates of aggressive behavior.
Article in Journal of pathology and translational medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Low-grade fibro-osseous lesions can be challenging to classify. A 33-year-old man presented with synchronous lesions involving the ilium and T2 vertebra. Because of an impending pathologic fracture, he received several doses of denosumab. Initial biopsies showed bland fibro-osseous lesions lacking GNAS or MDM2 alterations and were favored to represent polyostotic fibrous dysplasia. Subsequent iliac curettage revealed a fascicular spindle cell proliferation with subtle atypia and focal ossification, leading to a revised diagnosis of low-grade fibrosarcoma. Re-biopsy of the T2 lesion demonstrated a similar spindle cell proliferation without ossification. Sequencing identified copy number gains involving KIT, PDGFRA, and TERT. At 16-month follow-up, two metastatic pulmonary nodules developed, one responsive to chemotherapy. The patient remains alive with disease at 27 months after presentation. This case highlights a diagnostic pitfall in which low-grade fibrosarcoma with denosumab-associated ossification may mimic fibrous dysplasia and underscores the prognostic value of molecular profiling beyond histologic grading.
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