Clinical Report: Bilateral Distal Femoral Sclerosis in Older Women

Overview

A retrospective, two-center study describes a bilateral, non-aggressive intramedullary sclerosis pattern in the distal femoral metadiaphyses of older women. The supplied study summary links the pattern to fat necrosis and dystrophic calcification, with histopathologic correlation available in one patient.

Background

Intramedullary femoral sclerosis can occur with tumoral, metabolic, systemic, and mechanical disorders. The article reports that this particular bilateral distribution and morphology had not previously been documented in the literature. When lesions are indeterminate, further imaging, laboratory testing, specialist consultation, or biopsy may be pursued to exclude malignancy or systemic disease, potentially increasing healthcare use and patient anxiety. The study therefore assessed whether the imaging appearance represents a recognizable pattern.

Data Highlights

Key Findings

• The study focused on bilateral intramedullary sclerosis centered in the distal femoral metadiaphyses, identified on anteroposterior and lateral knee radiographs.
• Lesions were round or elongated and could occasionally merge into larger lesions; the described pattern lacked cortical erosion, periosteal reaction, and soft-tissue extension.
• Patients with known skeletal disorders or alternative explanations—including bone infarction, enchondroma, bone island, fibrous dysplasia, infection, fracture, Paget disease, and sclerosis related to a prominent linea aspera—were excluded.
• Imaging review included available knee radiographs, full-length lower-limb radiographs, CT, and MRI obtained within two years of the index radiographs.
• The supplied web research summary reports homogeneous intermediate signal in surrounding marrow on proton-density fat-suppressed MRI, with otherwise normal fatty marrow signal on T1- and T2-weighted images.
• Histopathology in one patient reportedly showed fat necrosis with dystrophic calcification and no histologic features typical of medullary osteonecrosis.

Clinical Implications

The authors describe the pattern as non-aggressive and propose it as a recognizable imaging presentation associated with fat necrosis and dystrophic calcification. The supplied material does not provide a specific management protocol for patients with this pattern; it notes that indeterminate sclerotic lesions may otherwise prompt additional imaging, laboratory evaluation, consultation, or biopsy.

Conclusion

The article characterizes bilateral distal femoral metadiaphyseal sclerosis in older women as a distinct benign imaging pattern, with fat necrosis and dystrophic calcification reported as the tissue correlate in one case. The supplied study excerpt does not include cohort size or prevalence results.

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