[Clinical Picture] Periosteal aneurysmal bone cyst

A 29-year-old woman with known type 2 diabetes presented to the musculoskeletal oncology clinic at the McGill University Health Centre (Montreal, QC, Canada) in February, 2015, with complaints of pain and swelling of her left leg for a few months. According to the patient, her swelling had increased in size over a few months before presentation. The pain was confined to the medial aspect of the proximal leg. On examination, she did not have any skin changes, but had a tender palpable mass measuring approximately 8·0 cm.

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