Chondrosarcoma

Description: Clinical presentation: History of pain in the right shoulder in 30 year old.
There is a dense expansion of the bone on the medial side of the upper metaphysis of the right humerus with a base of thickened cortex. The lesion is also within the bone extending towards the diaphysis with a well-defined margin between higher and normal density. A soft tissue mass displaces the margin of the usual deltoid insertion. There is no visible lamellar periosteal reaction, although some irregular erosion of the lateral cortical margin is just visible on the lateral side below the greater tuberosity.