Intramedullary osteoblastoma of the femur: a case report.

Ben Thompson, Jonathan Gibson, Hasaam Uldin, Sumathi Vaiyapuri, Rajesh Botchu

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In one paragraph

Article in Skeletal radiology, 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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5 · Who and what money

Authors and funding

5 authors.

Ben ThompsonCollege of Medical and Dental Sciences, University of Birmingham, Birmingham, UK.

Jonathan GibsonCollege of Medical and Dental Sciences, University of Birmingham, Birmingham, UK.

Hasaam UldinDepartment of Musculoskeletal Radiology, The Royal Orthopaedic Hospital, Bristol Road South, Northfield, Birmingham, B31 2AP, UK.

Sumathi VaiyapuriDepartment of Musculoskeletal Pathology, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK.

Rajesh BotchuDepartment of Musculoskeletal Radiology, The Royal Orthopaedic Hospital, Bristol Road South, Northfield, Birmingham, B31 2AP, UK. drrajeshb@gmail.com.ORCID http://orcid.org/0000-0001-7998-2980

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

introductionOsteoblastoma is a rare primary bone tumour, and the lesions are typically intracortical affecting long-bone metaphysis and the posterior spine. The histological hallmark is characteristic networks of trabeculated woven bone, usually lined by osteoblasts within a vascularised stroma. This case report details an unusual case of an intramedullary osteoblastoma of the femur. CASE PRESENTATION: A 22-year-old male presented with an eight-month history of right knee pain on a background of a previous distal tibia non-ossifying fibroma. The patient underwent cross-sectional imaging, and a biopsy was obtained confirming a lesion in the distal femoral diametaphysis. MRI showed multiple internal fluid levels and septations with a sclerotic rim and associated marrow oedema, cortical sclerosis, and periosteal soft tissue oedema. Subsequent biopsy provided histological confirmation of osteoblastoma.

conclusionThis case is presented to highlight the rare anatomical location for osteoblastoma: in the medullary canal of the distal femur.

Indexed as

Bone NeoplasmsFemoral NeoplasmsMagnetic Resonance ImagingOsteoblastomaBiopsyDiagnosis, DifferentialFemurHumansMaleYoung AdultBone neoplasmsDiaphysisFemurMagnetic resonance imagingMedullary cavityOsteoblastoma

Identifiers

PMID42274785

DOI10.1007/s00256-026-05282-4

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