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A man with multiple tumors causing stiff joints

Case Identification
Case ID Number: 
20090727SJ
Benign/Malignant: 
unknown
Clinical case information
Case presentation: 

A 39 year old man had a history of pain and progressive loss of motion of the left hip and knee.

Radiological findings:: 
Radiographically, the lesions show undulating cortical hyperostosis which has the appearance of flowing candle wax. There are also soft tissue masses which are mineralized. The femor lesions show narrowing of the medullary canal. The cortical hyperostosis extends across or nearly across joints and causes loss of motion. Extensive soft tissue masses may develop, most of which are adjacent to the involved bone, but some may be unconnected to the bone. The soft tissue masses become more ossified over time. Heterogeneous signal intensity is seen on MR imaging due to the mixture of osseous, fibrous, adipose, and cartilagenous tissue these contain. The soft tissue lesions enhance with IV gadolinium. An erroneous dignosis of sarcoma is possible, particularly when the soft tisue lesion is unmineralized.
Special Features of this Case:: 
What is the diagnosis?