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 36-year-old male with a 1-year history of progressive knee pain. Anteroposterior (A) and lateral (B) radiographs of the knee show a lytic, expansile, aggressive bony lesion in the distal portion of the right femur that extends into the intercondylar region. The lesion appears to spare the medial 2 cm of distal femoral cortex. Punctate calcifications noted within the femur and associated with the extra osseous component can be easily seen on the computed tomography scans
(C, D). What’s your diagnosis?

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

Find the answer to this month’s challenge below

Answer
This month’s challenge appears on page 14. According to Valerae O. Lewis, MD, who submitted the case, the patient was diagnosed with plasmacytoma with amyloid deposit.

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