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32 year old man with pain in the knee

Case Identification
Case ID Number: 
20090709pk
Periosteal Reaction: 
absent
Benign/Malignant: 
unknown
Clinical case information
Case presentation: 

A 32 year old man presented with pain in the lateral aspect of his knee for six weeks. He had no history of injury and was otherwise healthy. Radiographs and bone scan are shown at right.

Laboratory results:: 
Labs were normal.
Differential Diagnosis: 
The differential should include active bone tumors that are likely to occur around the knee of an adult. The possibilities include aneurysmal bone cyst, eosinophilic granuloma, giant cell tumor, lymphoma, and infection. Tumors and lesions that might occur in this setting but are less likely include hyperparathyroidism, osteosarcoma, Ewing's sarcoma, myeloma, lymphoma, angiosarcoma, adamantinoma, and fibrous dysplasia.