Intraosseous haemophilic pseudotumour
known case of haemophilia presented with pain and swelling in right knee.
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There is a well defined, slightly expansile, osteolytic lesion seen involving proximal right tibia. The lesion is surrounded by thin sclerotic rim and displaying thin incomplete septae like structures.
Lateral radiograph shows scalloping of the posterior margin of tibia (smaller arrows in the annotated image) and radiating trabeculae (larger arrow in the annotated image) mimicking malignant or infectious periosteal reaction.
In a known case of haemophilia and considering the age of the patient imaging features are most likely suggestive of intraosseous haemophilic pseudotumour.