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Difficulty: MediumOrthopedic Surgery

Match each primary bone tumor with its most characteristic radiographic finding and classic anatomical location.

  • OsteosarcomaA destructive, mixed lytic and blastic lesion in the metaphysis showing a 'sunburst' periosteal reaction and Codman triangle.
  • Ewing sarcomaA permeative, destructive lesion in the diaphysis with a multilaminated, 'onion-skin' periosteal reaction.
  • Giant cell tumor of boneAn eccentrically located, purely lytic lesion in the epiphysis demonstrating a classic 'soap bubble' appearance.
  • Osteoid osteomaA radiolucent cortical nidus less than 2 cm in diameter that is surrounded by dense, thick reactive sclerosis.

Answer

Osteosarcoma matches with the metaphyseal lesion showing a sunburst pattern. Ewing sarcoma matches with the diaphyseal lesion showing an onion-skin pattern. Giant cell tumor matches with the epiphyseal lytic soap-bubble lesion. Osteoid osteoma matches with the radiolucent nidus surrounded by thick sclerosis.
Each primary bone tumor has a classic pathognomonic radiographic appearance and predilection for a specific segment of the long bone (epiphysis, metaphysis, or diaphysis). Osteosarcoma favors the metaphysis (sunburst), Ewing sarcoma favors the diaphysis (onion-skin), Giant cell tumor favors the epiphysis (soap-bubble), and Osteoid osteoma produces a characteristic sclerotic nidus.

Step-by-Step Solution

1
Analyze the location and radiographic pattern associated with Osteosarcoma.
Identified as a metaphyseal lesion with a 'sunburst' periosteal reaction and Codman triangle.
Osteosarcoma is a highly malignant primary bone tumor that classically occurs at the metaphysis of long bones and induces aggressive, disorganized new bone formation.
2
Analyze the location and radiographic pattern associated with Ewing sarcoma.
Identified as a diaphyseal permeative lesion with an 'onion-skin' periosteal reaction.
Ewing sarcoma stems from neuroectodermal cells, typically growing in the marrow cavity of the diaphysis and causing concentric layers of reactive bone.
3
Analyze the location and radiographic pattern associated with Giant cell tumor of bone.
Identified as an epiphyseal, eccentric lytic lesion with a 'soap bubble' appearance.
Giant cell tumors are locally aggressive but generally benign lesions that classically affect the epiphyseal region of closed growth plates.
4
Analyze the radiographic pattern associated with Osteoid osteoma.
Identified as a small radiolucent cortical nidus surrounded by dense sclerosis.
Osteoid osteomas are small benign tumors where the prostaglandin-secreting central nidus triggers prominent surrounding reactive bone formation.

Key Concept

Radiographic and anatomical characteristics of primary bone tumors.
Estimated Time:1m 30s
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Orthopedic Surgery

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