What’s your Diagnosis?

In this feature, AAOS Now publishes a series of images, challenging readers to diagnose the condition depicted. The images for this month’s challenge were submitted by Valerae O. Lewis, MD, who provided the following information:

The patient is a 57-year-old man, who complained of pain when sitting. The pain was localized to the sacral region and radiated to the left hip. He also noted pain in the left lower extremity. He denied bowel and bladder problems but noted some diminished sexual function and difficulty maintaining an erection. Conservative treatment was ineffective. Evaluation revealed a mass in the sacrum with some erosion of the sacrum. A small specimen initial biopsy was inconclusive. What’s your diagnosis?

Do you have a challenging case you’d like to submit for publication? E-mail a short case description and any accompanying images to aaoscomm@aaos.org

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