Primary bone leiomyosarcoma of distal femur: case report and literature review

Vol. 63 No. 3, 2022


Vlad Alexandru Georgeanu, Raluca Ioana Pletosu, Teodora Camelia Vladescu, Simona Bondari, Andrea Craciunescu, Octav Marius Russu

We present the case of a 58-year-old patient presented with a spontaneous right supracondylar fracture. The initial bone biopsy, highlighted the defining histopathological (HP) elements for a leiomyosarcoma (LMS), initially considered a metastasis. The complex imaging examinations did not reveal another tumor, so the final diagnosis was primary bone LMS. Final treatment was a wide tumor resection and reconstruction with a knee tumor prosthesis, preceded and followed by three cytostatic cycles (Doxorubicin 75 mg/sqm). The HP examination has confirmed the previous diagnosis. The key microscopic features for the diagnosis of bone LMS was: malignant mesenchymal proliferation composed of intersecting fascicles of cells with eosinophilic, fibrillary cytoplasm and pleomorphic, elongated, blunt-ended, cigar-shaped nuclei of variable sizes; variable mitotic count; presence of tumor necrosis and stroma with changes that include hyalinization, myxoid change, with absence of chondroid or osteoid matrix; diffuse positivity for smooth muscle immunohistochemical markers: smooth muscle actin, desmin, h-caldesmon. At 12 months after the tumor resection, the patient is in good condition without any sign of local recurrence or metastatic disease. LMS represents a type of soft tissue sarcoma (STS), a variant of the spindle cell sarcomas, accounting for about 7% to 10% of all STS. Bone LMS can be primary or secondary; the primary variant is very rare, representing a very small percentage (around 0.7%) of all primary malignant bone tumors, according to the literature data. Very few cases are presented in the literature; the management of this kind of tumor is controversial, especially regarding the chemo- and radiotherapy.

Corresponding author: Vlad Alexandru Georgeanu, MD; e-mail:

DOI: 10.47162/RJME.63.3.12 Download PDF
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