A Giant Humeral Parosteal Lipoma.

Area of Science:

• Orthopedic Surgery
• Skeletal Radiology
• Oncology

Background:

• Parosteal lipomas are rare benign tumors arising from the bone surface.
• They can present diagnostic challenges due to atypical imaging features that may mimic malignant neoplasms.
• Early and accurate diagnosis is crucial for appropriate management.

Observation:

• A 70-year-old male presented with a large, painless shoulder mass causing functional limitation.
• Imaging demonstrated a fatty lesion with osseous excrescence and irregular cortical changes.
• These atypical features can be mistaken for more aggressive bone tumors.

Findings:

• Biopsy confirmed the diagnosis of parosteal lipoma.
• Surgical excision was performed due to the tumor's size and functional impact.
• Histopathological analysis revealed a benign fatty tumor originating on the bone cortex.

Implications:

• This case highlights the importance of considering rare diagnoses like parosteal lipoma, even with atypical imaging.
• Successful surgical management can lead to significant functional improvement and long-term remission.
• Awareness of parosteal lipoma's varied presentation aids in differentiating it from malignant bone lesions.