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knee, thigh, distal femur, proximal tibia

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.

50 year old tennis player with pain in the knee .

Case Identification
Case ID Number: 
20091117AD
Benign/Malignant: 
unknown
Clinical case information
Case presentation: 

The patient is a very pleasant woman who is an active tennis player and 50 years of age. She has had aching pain in the left knee and a radiograph revealed a bone lesion in the proximal tibia. The patient is seen at the request of her orthopedic surgeon.

Radiological findings:: 
The patient is generally healthy. She is currently taking no medicines. There is no family history of bone lesions or bone tumors. On detailed examination, the patient is in no acute distress, and is oriented to time, place, and person. Examination of the right knee shows normal appearance. There is no effusion. There is no erythema or swelling, no ecchymosis or bruising noted. The alignment of the knee is normal. The range of motion is full. In the proximal tibia there is no mass palpable. There is no tenderness over the proximal bone. There is no erythema or sign of inflammation. There is no popliteal adenopathy, no inguinal adenopathy, and no cervical adenopathy. The skin is normal and there is no cafe au lait spots.

51 year old with knee pain

Case Identification
Case ID Number: 
20090721KP
Periosteal Reaction: 
absent
Benign/Malignant: 
unknown
Clinical case information
Case presentation: 

A 51 year old woman presents with left knee pain for 1 year. There has been no previous history of disease, injury, or exposure.

Radiological findings:: 
A lytic lesion is seen in the distal femur o mien no previous li> smillo
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Radiological findings:: 
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51 year old with knee pain

Case Identification
Case ID Number: 
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20091117AD
Benign/Malignant: 
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