Intramedullary osteoblastoma of the femur: a case report
Abstract
Introduction: Osteoblastoma 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.
Conclusion: This case is presented to highlight the rare anatomical location for osteoblastoma: in the medullary canal of the distal femur.
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Evidence Hub reads this as a case report, done in people. Its evidence level is 5 of 5 (Very low · case / narrative / animal / in vitro / in silico). Case reports, narrative reviews, and animal, cell or computer-model studies give the weakest evidence for human health.
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